21496643525952 has 168 divisors, whose sum is σ = 72056210081856. Its totient is φ = 5999063261184.

The previous prime is 21496643525947. The next prime is 21496643526011. The reversal of 21496643525952 is 25952534669412.

21496643525952 is a `hidden beast` number, since 2 + 1 + 4 + 9 + 6 + 6 + 4 + 35 + 2 + 595 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 21496643525952.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61820913 + ... + 62167664.

It is an arithmetic number, because the mean of its divisors is an integer number (428906012392).

Almost surely, 2^{21496643525952} is an apocalyptic number.

It is an amenable number.

21496643525952 is an abundant number, since it is smaller than the sum of its proper divisors (50559566555904).

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

21496643525952 is a wasteful number, since it uses less digits than its factorization.

21496643525952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123988645 (or 123988632 counting only the distinct ones).

The product of its digits is 139968000, while the sum is 63.

The spelling of 21496643525952 in words is "twenty-one trillion, four hundred ninety-six billion, six hundred forty-three million, five hundred twenty-five thousand, nine hundred fifty-two".