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102111221 = 971052693
BaseRepresentation
bin1100001011000…
…01011111110101
321010010210021002
412011201133311
5202120024341
614044333045
72346634232
oct605413765
9233123232
10102111221
1152703743
122a244185
1318202754
14d7c0789
158e7029b
hex61617f5

102111221 has 4 divisors (see below), whose sum is σ = 103164012. Its totient is φ = 101058432.

The previous prime is 102111203. The next prime is 102111239. The reversal of 102111221 is 122111201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122111201 = 313939071.

It is an interprime number because it is at equal distance from previous prime (102111203) and next prime (102111239).

It can be written as a sum of positive squares in 2 ways, for example, as 45711121 + 56400100 = 6761^2 + 7510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-102111221 is a prime.

It is a super-2 number, since 2×1021112212 = 20853402908221682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102111521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526250 + ... + 526443.

It is an arithmetic number, because the mean of its divisors is an integer number (25791003).

Almost surely, 2102111221 is an apocalyptic number.

It is an amenable number.

102111221 is a deficient number, since it is larger than the sum of its proper divisors (1052791).

102111221 is an equidigital number, since it uses as much as digits as its factorization.

102111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052790.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 102111221 is about 10105.0096981646. The cubic root of 102111221 is about 467.4026350277.

Adding to 102111221 its reverse (122111201), we get a palindrome (224222422).

The spelling of 102111221 in words is "one hundred two million, one hundred eleven thousand, two hundred twenty-one".

Divisors: 1 97 1052693 102111221