21311616321053 has 16 divisors (see below), whose sum is σ = 21503602041600. Its totient is φ = 21120217551360.

The previous prime is 21311616321031. The next prime is 21311616321071. The reversal of 21311616321053 is 35012361611312.

It is a cyclic number.

It is not a de Polignac number, because 21311616321053 - 2³⁶ = 21242896844317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311616021053) 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 15 ways as a sum of consecutive naturals, for example, 173033333 + ... + 173156453.

It is an arithmetic number, because the mean of its divisors is an integer number (1343975127600).

Almost surely, 2^{21311616321053} is an apocalyptic number.

It is an amenable number.

21311616321053 is a deficient number, since it is larger than the sum of its proper divisors (191985720547).

21311616321053 is a wasteful number, since it uses less digits than its factorization.

21311616321053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125492.

The product of its (nonzero) digits is 19440, while the sum is 35.

Adding to 21311616321053 its reverse (35012361611312), we get a palindrome (56323977932365).

The spelling of 21311616321053 in words is "twenty-one trillion, three hundred eleven billion, six hundred sixteen million, three hundred twenty-one thousand, fifty-three".