1231355105020 has 48 divisors (see below), whose sum is σ = 2670398631936. Its totient is φ = 476450280000.

The previous prime is 1231355104957. The next prime is 1231355105047. The reversal of 1231355105020 is 205015531321.

It is a self number, because there is not a number n which added to its sum of digits gives 1231355105020.

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, 1035235 + ... + 1880005.

It is an arithmetic number, because the mean of its divisors is an integer number (55633304832).

Almost surely, 2^{1231355105020} is an apocalyptic number.

1231355105020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231355105020 is an abundant number, since it is smaller than the sum of its proper divisors (1439043526916).

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

1231355105020 is a wasteful number, since it uses less digits than its factorization.

1231355105020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847162 (or 847160 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The spelling of 1231355105020 in words is "one trillion, two hundred thirty-one billion, three hundred fifty-five million, one hundred five thousand, twenty".