31123212020100 has 144 divisors (see below), whose sum is σ = 100334071958400. Its totient is φ = 8276404498560.

The previous prime is 31123212020071. The next prime is 31123212020137. The reversal of 31123212020100 is 102021232113.

31123212020100 is a `hidden beast` number, since 31 + 12 + 321 + 202 + 0 + 100 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15085179 + ... + 17023778.

It is an arithmetic number, because the mean of its divisors is an integer number (696764388600).

Almost surely, 2^{31123212020100} is an apocalyptic number.

31123212020100 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31123212020100 is an abundant number, since it is smaller than the sum of its proper divisors (69210859938300).

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

31123212020100 is a wasteful number, since it uses less digits than its factorization.

31123212020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32109339 (or 32109326 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31123212020100 its reverse (102021232113), we get a palindrome (31225233252213).

The spelling of 31123212020100 in words is "thirty-one trillion, one hundred twenty-three billion, two hundred twelve million, twenty thousand, one hundred".