21311302231323 has 60 divisors (see below), whose sum is σ = 34594472131560. Its totient is φ = 13068303640704.

The previous prime is 21311302231301. The next prime is 21311302231363. The reversal of 21311302231323 is 32313220311312.

21311302231323 is a `hidden beast` number, since 2 + 1 + 3 + 1 + 1 + 302 + 2 + 31 + 323 = 666.

It is not a de Polignac number, because 21311302231323 - 2⁵ = 21311302231291 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21311302231363) 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 59 ways as a sum of consecutive naturals, for example, 1123423 + ... + 6624551.

It is an arithmetic number, because the mean of its divisors is an integer number (576574535526).

Almost surely, 2^{21311302231323} is an apocalyptic number.

21311302231323 is a deficient number, since it is larger than the sum of its proper divisors (13283169900237).

21311302231323 is a wasteful number, since it uses less digits than its factorization.

21311302231323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5501450 (or 5501428 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

Adding to 21311302231323 its reverse (32313220311312), we get a palindrome (53624522542635).

The spelling of 21311302231323 in words is "twenty-one trillion, three hundred eleven billion, three hundred two million, two hundred thirty-one thousand, three hundred twenty-three".