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102111220 = 2255105561
BaseRepresentation
bin1100001011000…
…01011111110100
321010010210021001
412011201133310
5202120024340
614044333044
72346634231
oct605413764
9233123231
10102111220
1152703742
122a244184
1318202753
14d7c0788
158e7029a
hex61617f4

102111220 has 12 divisors (see below), whose sum is σ = 214433604. Its totient is φ = 40844480.

The previous prime is 102111203. The next prime is 102111239. The reversal of 102111220 is 22111201.

It can be written as a sum of positive squares in 2 ways, for example, as 71707024 + 30404196 = 8468^2 + 5514^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 102111197 and 102111206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2552761 + ... + 2552800.

It is an arithmetic number, because the mean of its divisors is an integer number (17869467).

Almost surely, 2102111220 is an apocalyptic number.

102111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102111220 is an abundant number, since it is smaller than the sum of its proper divisors (112322384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102111220 is a wasteful number, since it uses less digits than its factorization.

102111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5105570 (or 5105568 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 102111220 is about 10105.0096486842. The cubic root of 102111220 is about 467.4026335019.

Adding to 102111220 its reverse (22111201), we get a palindrome (124222421).

The spelling of 102111220 in words is "one hundred two million, one hundred eleven thousand, two hundred twenty".

Divisors: 1 2 4 5 10 20 5105561 10211122 20422244 25527805 51055610 102111220