21321200313021 has 16 divisors (see below), whose sum is σ = 32489632203264. Its totient is φ = 12183473995824.

The previous prime is 21321200313001. The next prime is 21321200313059. The reversal of 21321200313021 is 12031300212312.

It is not a de Polignac number, because 21321200313021 - 2¹⁴ = 21321200296637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321200313001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1041550 + ... + 6612656.

It is an arithmetic number, because the mean of its divisors is an integer number (2030602012704).

Almost surely, 2^{21321200313021} is an apocalyptic number.

21321200313021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21321200313021 is a deficient number, since it is larger than the sum of its proper divisors (11168431890243).

21321200313021 is a wasteful number, since it uses less digits than its factorization.

21321200313021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5753360.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21321200313021 its reverse (12031300212312), we get a palindrome (33352500525333).

The spelling of 21321200313021 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred million, three hundred thirteen thousand, twenty-one".