131303122020021 has 24 divisors (see below), whose sum is σ = 210223300041984. Its totient is φ = 72610021391040.

The previous prime is 131303122020001. The next prime is 131303122020043. The reversal of 131303122020021 is 120020221303131.

It is not a de Polignac number, because 131303122020021 - 2⁷ = 131303122019893 is a prime.

It is a super-2 number, since 2×131303122020021² (a number of 29 digits) contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 131303122020021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131303122020001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14406745720 + ... + 14406754833.

It is an arithmetic number, because the mean of its divisors is an integer number (8759304168416).

Almost surely, 2^{131303122020021} is an apocalyptic number.

It is an amenable number.

131303122020021 is a deficient number, since it is larger than the sum of its proper divisors (78920178021963).

131303122020021 is a wasteful number, since it uses less digits than its factorization.

131303122020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28813500601 (or 28813500594 counting only the distinct ones).

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

Adding to 131303122020021 its reverse (120020221303131), we get a palindrome (251323343323152).

The spelling of 131303122020021 in words is "one hundred thirty-one trillion, three hundred three billion, one hundred twenty-two million, twenty thousand, twenty-one".