21023134041321 has 64 divisors (see below), whose sum is σ = 31729909155840. Its totient is φ = 13753486393920.

The previous prime is 21023134041257. The next prime is 21023134041379. The reversal of 21023134041321 is 12314043132012.

21023134041321 is a `hidden beast` number, since 2 + 1 + 0 + 231 + 3 + 404 + 1 + 3 + 21 = 666.

It is not a de Polignac number, because 21023134041321 - 2⁶ = 21023134041257 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 (21023134041121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2254970566 + ... + 2254979888.

It is an arithmetic number, because the mean of its divisors is an integer number (495779830560).

Almost surely, 2^{21023134041321} is an apocalyptic number.

It is an amenable number.

21023134041321 is a deficient number, since it is larger than the sum of its proper divisors (10706775114519).

21023134041321 is a wasteful number, since it uses less digits than its factorization.

21023134041321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12443 (or 12437 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 21023134041321 its reverse (12314043132012), we get a palindrome (33337177173333).

The spelling of 21023134041321 in words is "twenty-one trillion, twenty-three billion, one hundred thirty-four million, forty-one thousand, three hundred twenty-one".