331221220211320 has 32 divisors (see below), whose sum is σ = 745340105570400. Its totient is φ = 132472068512128.

The previous prime is 331221220211149. The next prime is 331221220211339. The reversal of 331221220211320 is 23112022122133.

It is a super-2 number, since 2×331221220211320² (a number of 30 digits) contains 22 as substring.

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, 512784844 + ... + 513430363.

It is an arithmetic number, because the mean of its divisors is an integer number (23291878299075).

Almost surely, 2^{331221220211320} is an apocalyptic number.

It is an amenable number.

331221220211320 is an abundant number, since it is smaller than the sum of its proper divisors (414118885359080).

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

331221220211320 is a wasteful number, since it uses less digits than its factorization.

331221220211320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026223287 (or 1026223283 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 331221220211320 its reverse (23112022122133), we get a palindrome (354333242333453).

The spelling of 331221220211320 in words is "three hundred thirty-one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred eleven thousand, three hundred twenty".