21675874556 has 12 divisors (see below), whose sum is σ = 43351749168. Its totient is φ = 9289660512.

The previous prime is 21675874543. The next prime is 21675874589. The reversal of 21675874556 is 65547857612.

21675874556 is an admirable number.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

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, 387069161 + ... + 387069216.

It is an arithmetic number, because the mean of its divisors is an integer number (3612645764).

Almost surely, 2^21675874556 is an apocalyptic number.

It is an amenable number.

21675874556 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21675874556 is a wasteful number, since it uses less digits than its factorization.

21675874556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774138388 (or 774138386 counting only the distinct ones).

The product of its digits is 14112000, while the sum is 56.

The spelling of 21675874556 in words is "twenty-one billion, six hundred seventy-five million, eight hundred seventy-four thousand, five hundred fifty-six".