312121311322220 has 24 divisors (see below), whose sum is σ = 665237660552304. Its totient is φ = 122985113714496.

The previous prime is 312121311322201. The next prime is 312121311322291. The reversal of 312121311322220 is 22223113121213.

It is a self number, because there is not a number n which added to its sum of digits gives 312121311322220.

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, 116463174527 + ... + 116463177206.

It is an arithmetic number, because the mean of its divisors is an integer number (27718235856346).

Almost surely, 2^{312121311322220} is an apocalyptic number.

It is an amenable number.

312121311322220 is an abundant number, since it is smaller than the sum of its proper divisors (353116349230084).

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

312121311322220 is a wasteful number, since it uses less digits than its factorization.

312121311322220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232926351809 (or 232926351807 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 312121311322220 its reverse (22223113121213), we get a palindrome (334344424443433).

The spelling of 312121311322220 in words is "three hundred twelve trillion, one hundred twenty-one billion, three hundred eleven million, three hundred twenty-two thousand, two hundred twenty".