313121021990 has 64 divisors (see below), whose sum is σ = 647365533696. Its totient is φ = 106818486912.

The previous prime is 313121021989. The next prime is 313121022077. The reversal of 313121021990 is 99120121313.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13176059 + ... + 13199801.

It is an arithmetic number, because the mean of its divisors is an integer number (10115086464).

Almost surely, 2^313121021990 is an apocalyptic number.

313121021990 is an abundant number, since it is smaller than the sum of its proper divisors (334244511706).

313121021990 is a wasteful number, since it uses less digits than its factorization.

313121021990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24693.

The product of its (nonzero) digits is 2916, while the sum is 32.

The spelling of 313121021990 in words is "three hundred thirteen billion, one hundred twenty-one million, twenty-one thousand, nine hundred ninety".