331121312220 has 24 divisors (see below), whose sum is σ = 927139674384. Its totient is φ = 88299016576.

The previous prime is 331121312209. The next prime is 331121312293. The reversal of 331121312220 is 22213121133.

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, 2759344209 + ... + 2759344328.

It is an arithmetic number, because the mean of its divisors is an integer number (38630819766).

Almost surely, 2^331121312220 is an apocalyptic number.

331121312220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

331121312220 is an abundant number, since it is smaller than the sum of its proper divisors (596018362164).

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

331121312220 is a wasteful number, since it uses less digits than its factorization.

331121312220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5518688549 (or 5518688547 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 331121312220 its reverse (22213121133), we get a palindrome (353334433353).

The spelling of 331121312220 in words is "three hundred thirty-one billion, one hundred twenty-one million, three hundred twelve thousand, two hundred twenty".