21320012233021 has 4 divisors (see below), whose sum is σ = 21368577181600. Its totient is φ = 21271447284444.

The previous prime is 21320012233001. The next prime is 21320012233073. The reversal of 21320012233021 is 12033221002312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21320012233021 - 2⁵ = 21320012232989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21320012232983 and 21320012233001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320012233001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24282473631 + ... + 24282474508.

It is an arithmetic number, because the mean of its divisors is an integer number (5342144295400).

Almost surely, 2^{21320012233021} is an apocalyptic number.

It is an amenable number.

21320012233021 is a deficient number, since it is larger than the sum of its proper divisors (48564948579).

21320012233021 is an equidigital number, since it uses as much as digits as its factorization.

21320012233021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48564948578.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21320012233021 its reverse (12033221002312), we get a palindrome (33353233235333).

The spelling of 21320012233021 in words is "twenty-one trillion, three hundred twenty billion, twelve million, two hundred thirty-three thousand, twenty-one".