21356260164752 has 20 divisors (see below), whose sum is σ = 41510801519616. Its totient is φ = 10643795256480.

The previous prime is 21356260164713. The next prime is 21356260164761. The reversal of 21356260164752 is 25746106265312.

It is a self number, because there is not a number n which added to its sum of digits gives 21356260164752.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2145921488 + ... + 2145931439.

Almost surely, 2^{21356260164752} is an apocalyptic number.

It is an amenable number.

21356260164752 is a deficient number, since it is larger than the sum of its proper divisors (20154541354864).

21356260164752 is a wasteful number, since it uses less digits than its factorization.

21356260164752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4291853246 (or 4291853240 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 50.

The spelling of 21356260164752 in words is "twenty-one trillion, three hundred fifty-six billion, two hundred sixty million, one hundred sixty-four thousand, seven hundred fifty-two".