20212231331021 has 4 divisors (see below), whose sum is σ = 20864238793344. Its totient is φ = 19560223868700.

The previous prime is 20212231330997. The next prime is 20212231331029. The reversal of 20212231331021 is 12013313221202.

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 20212231331021 - 2³⁸ = 19937353424077 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 (20212231331029) 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, 326003731115 + ... + 326003731176.

It is an arithmetic number, because the mean of its divisors is an integer number (5216059698336).

Almost surely, 2^{20212231331021} is an apocalyptic number.

It is an amenable number.

20212231331021 is a deficient number, since it is larger than the sum of its proper divisors (652007462323).

20212231331021 is an equidigital number, since it uses as much as digits as its factorization.

20212231331021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652007462322.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 20212231331021 its reverse (12013313221202), we get a palindrome (32225544552223).

The spelling of 20212231331021 in words is "twenty trillion, two hundred twelve billion, two hundred thirty-one million, three hundred thirty-one thousand, twenty-one".