21062689956 has 96 divisors (see below), whose sum is σ = 68081448960. Its totient is φ = 5470826400.

The previous prime is 21062689943. The next prime is 21062690023. The reversal of 21062689956 is 65998626012.

It is a happy number.

21062689956 is a `hidden beast` number, since 2 + 1 + 0 + 626 + 8 + 9 + 9 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1258080 + ... + 1274711.

It is an arithmetic number, because the mean of its divisors is an integer number (709181760).

Almost surely, 2^21062689956 is an apocalyptic number.

It is an amenable number.

21062689956 is an abundant number, since it is smaller than the sum of its proper divisors (47018759004).

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

21062689956 is a wasteful number, since it uses less digits than its factorization.

21062689956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532822 (or 2532814 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The spelling of 21062689956 in words is "twenty-one billion, sixty-two million, six hundred eighty-nine thousand, nine hundred fifty-six".