21102414656 has 28 divisors (see below), whose sum is σ = 42156164100. Its totient is φ = 10480389120.

The previous prime is 21102414637. The next prime is 21102414673. The reversal of 21102414656 is 65641420112.

It can be written as a sum of positive squares in 2 ways, for example, as 10241440000 + 10860974656 = 101200^2 + 104216^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 1096925 + ... + 1115996.

Almost surely, 2^21102414656 is an apocalyptic number.

It is an amenable number.

21102414656 is a deficient number, since it is larger than the sum of its proper divisors (21053749444).

21102414656 is a wasteful number, since it uses less digits than its factorization.

21102414656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2213082 (or 2213072 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

Adding to 21102414656 its reverse (65641420112), we get a palindrome (86743834768).

The spelling of 21102414656 in words is "twenty-one billion, one hundred two million, four hundred fourteen thousand, six hundred fifty-six".