21656246132 has 48 divisors (see below), whose sum is σ = 41307000000. Its totient is φ = 9895302144.

The previous prime is 21656246123. The next prime is 21656246141. The reversal of 21656246132 is 23164265612.

It is an interprime number because it is at equal distance from previous prime (21656246123) and next prime (21656246141).

It is a super-2 number, since 2×21656246132² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2748863 + ... + 2756729.

It is an arithmetic number, because the mean of its divisors is an integer number (860562500).

Almost surely, 2^21656246132 is an apocalyptic number.

It is an amenable number.

21656246132 is a deficient number, since it is larger than the sum of its proper divisors (19650753868).

21656246132 is a wasteful number, since it uses less digits than its factorization.

21656246132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9168 (or 9166 counting only the distinct ones).

The product of its digits is 103680, while the sum is 38.

The spelling of 21656246132 in words is "twenty-one billion, six hundred fifty-six million, two hundred forty-six thousand, one hundred thirty-two".