31020121021988 has 24 divisors (see below), whose sum is σ = 62825561568000. Its totient is φ = 13126054825728.

The previous prime is 31020121021987. The next prime is 31020121022003. The reversal of 31020121021988 is 88912012102013.

It is not an unprimeable number, because it can be changed into a prime (31020121021987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7011779213 + ... + 7011783636.

It is an arithmetic number, because the mean of its divisors is an integer number (2617731732000).

Almost surely, 2^{31020121021988} is an apocalyptic number.

It is an amenable number.

31020121021988 is an abundant number, since it is smaller than the sum of its proper divisors (31805440546012).

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

31020121021988 is a wasteful number, since it uses less digits than its factorization.

31020121021988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14023562939 (or 14023562937 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 38.

The spelling of 31020121021988 in words is "thirty-one trillion, twenty billion, one hundred twenty-one million, twenty-one thousand, nine hundred eighty-eight".