31121254100 has 36 divisors (see below), whose sum is σ = 67622497404. Its totient is φ = 12432026880.

The previous prime is 31121254033. The next prime is 31121254111. The reversal of 31121254100 is 145212113.

It can be written as a sum of positive squares in 6 ways, for example, as 4999696 + 31116254404 = 2236^2 + 176398^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129857 + ... + 281256.

Almost surely, 2^31121254100 is an apocalyptic number.

It is an amenable number.

31121254100 is an abundant number, since it is smaller than the sum of its proper divisors (36501243304).

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

31121254100 is a wasteful number, since it uses less digits than its factorization.

31121254100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411884 (or 411877 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 31121254100 its reverse (145212113), we get a palindrome (31266466213).

The spelling of 31121254100 in words is "thirty-one billion, one hundred twenty-one million, two hundred fifty-four thousand, one hundred".