20331213203021 has 6 divisors (see below), whose sum is σ = 23650594950510. Its totient is φ = 17426754173976.

The previous prime is 20331213203017. The next prime is 20331213203101. The reversal of 20331213203021 is 12030231213302.

It can be written as a sum of positive squares in only one way, i.e., 18675837618025 + 1655375584996 = 4321555^2 + 1286614^2 .

It is not a de Polignac number, because 20331213203021 - 2² = 20331213203017 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 (20331213202021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 207461359166 + ... + 207461359263.

It is an arithmetic number, because the mean of its divisors is an integer number (3941765825085).

Almost surely, 2^{20331213203021} is an apocalyptic number.

It is an amenable number.

20331213203021 is a deficient number, since it is larger than the sum of its proper divisors (3319381747489).

20331213203021 is an equidigital number, since it uses as much as digits as its factorization.

20331213203021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414922718443 (or 414922718436 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 20331213203021 its reverse (12030231213302), we get a palindrome (32361444416323).

The spelling of 20331213203021 in words is "twenty trillion, three hundred thirty-one billion, two hundred thirteen million, two hundred three thousand, twenty-one".