313121021998 has 16 divisors (see below), whose sum is σ = 472754923344. Its totient is φ = 155536392960.

The previous prime is 313121021989. The next prime is 313121022077. The reversal of 313121021998 is 899120121313.

It is a self number, because there is not a number n which added to its sum of digits gives 313121021998.

It is a congruent number.

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, 1796638 + ... + 1963198.

It is an arithmetic number, because the mean of its divisors is an integer number (29547182709).

Almost surely, 2^313121021998 is an apocalyptic number.

313121021998 is a deficient number, since it is larger than the sum of its proper divisors (159633901346).

313121021998 is a wasteful number, since it uses less digits than its factorization.

313121021998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172707.

The product of its (nonzero) digits is 23328, while the sum is 40.

The spelling of 313121021998 in words is "three hundred thirteen billion, one hundred twenty-one million, twenty-one thousand, nine hundred ninety-eight".