31123012421000 has 32 divisors (see below), whose sum is σ = 72827849067480. Its totient is φ = 12449204968000.

The previous prime is 31123012420999. The next prime is 31123012421021. The reversal of 31123012421000 is 12421032113.

It can be written as a sum of positive squares in 4 ways, for example, as 20864559315076 + 10258453105924 = 4567774^2 + 3202882^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15561505211 + ... + 15561507210.

Almost surely, 2^{31123012421000} is an apocalyptic number.

It is an amenable number.

31123012421000 is an abundant number, since it is smaller than the sum of its proper divisors (41704836646480).

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

31123012421000 is a wasteful number, since it uses less digits than its factorization.

31123012421000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31123012442 (or 31123012428 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 31123012421000 its reverse (12421032113), we get a palindrome (31135433453113).

The spelling of 31123012421000 in words is "thirty-one trillion, one hundred twenty-three billion, twelve million, four hundred twenty-one thousand".