313121021988 has 96 divisors (see below), whose sum is σ = 778893147648. Its totient is φ = 97762291200.

The previous prime is 313121021987. The next prime is 313121021989. The reversal of 313121021988 is 889120121313.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (313121021987) and next prime (313121021989).

It is not an unprimeable number, because it can be changed into a prime (313121021987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1149958 + ... + 1395938.

It is an arithmetic number, because the mean of its divisors is an integer number (8113470288).

Almost surely, 2^313121021988 is an apocalyptic number.

It is an amenable number.

313121021988 is an abundant number, since it is smaller than the sum of its proper divisors (465772125660).

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

313121021988 is a wasteful number, since it uses less digits than its factorization.

313121021988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246133 (or 246131 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The spelling of 313121021988 in words is "three hundred thirteen billion, one hundred twenty-one million, twenty-one thousand, nine hundred eighty-eight".