21012023321020 has 48 divisors (see below), whose sum is σ = 45151998823008. Its totient is φ = 8209242961920.

The previous prime is 21012023321011. The next prime is 21012023321083. The reversal of 21012023321020 is 2012332021012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120244752 + ... + 120419368.

It is an arithmetic number, because the mean of its divisors is an integer number (940666642146).

Almost surely, 2^{21012023321020} is an apocalyptic number.

21012023321020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012023321020 is an abundant number, since it is smaller than the sum of its proper divisors (24139975501988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012023321020 is a wasteful number, since it uses less digits than its factorization.

21012023321020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314590 (or 314588 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21012023321020 its reverse (2012332021012), we get a palindrome (23024355342032).

The spelling of 21012023321020 in words is "twenty-one trillion, twelve billion, twenty-three million, three hundred twenty-one thousand, twenty".