123131213021020 has 48 divisors (see below), whose sum is σ = 259385144201568. Its totient is φ = 49098308878080.

The previous prime is 123131213021017. The next prime is 123131213021023. The reversal of 123131213021020 is 20120312131321.

It is an interprime number because it is at equal distance from previous prime (123131213021017) and next prime (123131213021023).

It is a super-2 number, since 2×123131213021020² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123131213020982 and 123131213021000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123131213021023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59711422 + ... + 61739098.

It is an arithmetic number, because the mean of its divisors is an integer number (5403857170866).

Almost surely, 2^{123131213021020} is an apocalyptic number.

123131213021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123131213021020 is an abundant number, since it is smaller than the sum of its proper divisors (136253931180548).

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

123131213021020 is a wasteful number, since it uses less digits than its factorization.

123131213021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2037190 (or 2037188 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 123131213021020 its reverse (20120312131321), we get a palindrome (143251525152341).

The spelling of 123131213021020 in words is "one hundred twenty-three trillion, one hundred thirty-one billion, two hundred thirteen million, twenty-one thousand, twenty".