21356264306553 has 32 divisors (see below), whose sum is σ = 31590896832000. Its totient is φ = 12723517536000.

The previous prime is 21356264306501. The next prime is 21356264306557. The reversal of 21356264306553 is 35560346265312.

It is not a de Polignac number, because 21356264306553 - 2¹⁶ = 21356264241017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21356264306496 and 21356264306505.

It is not an unprimeable number, because it can be changed into a prime (21356264306557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105911478 + ... + 106112928.

It is an arithmetic number, because the mean of its divisors is an integer number (987215526000).

Almost surely, 2^{21356264306553} is an apocalyptic number.

It is an amenable number.

21356264306553 is a deficient number, since it is larger than the sum of its proper divisors (10234632525447).

21356264306553 is a wasteful number, since it uses less digits than its factorization.

21356264306553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255973.

The product of its (nonzero) digits is 11664000, while the sum is 51.

The spelling of 21356264306553 in words is "twenty-one trillion, three hundred fifty-six billion, two hundred sixty-four million, three hundred six thousand, five hundred fifty-three".