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102311221 = 953107357
BaseRepresentation
bin1100001100100…
…10010100110101
321010111221121111
412012102110311
5202142424341
614052515021
72351426305
oct606222465
9233457544
10102311221
115282aa31
122a31ba71
13182727ac
14d833605
158eae681
hex6192535

102311221 has 4 divisors (see below), whose sum is σ = 102419532. Its totient is φ = 102202912.

The previous prime is 102311207. The next prime is 102311227. The reversal of 102311221 is 122113201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122113201 = 717444743.

It can be written as a sum of positive squares in 2 ways, for example, as 43956900 + 58354321 = 6630^2 + 7639^2 .

It is a cyclic number.

It is not a de Polignac number, because 102311221 - 27 = 102311093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102311227) 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, 52726 + ... + 54631.

It is an arithmetic number, because the mean of its divisors is an integer number (25604883).

Almost surely, 2102311221 is an apocalyptic number.

It is an amenable number.

102311221 is a deficient number, since it is larger than the sum of its proper divisors (108311).

102311221 is an equidigital number, since it uses as much as digits as its factorization.

102311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108310.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 102311221 is about 10114.9009387141. The cubic root of 102311221 is about 467.7075951832.

Adding to 102311221 its reverse (122113201), we get a palindrome (224424422).

The spelling of 102311221 in words is "one hundred two million, three hundred eleven thousand, two hundred twenty-one".

Divisors: 1 953 107357 102311221