312221404220144 has 20 divisors (see below), whose sum is σ = 625788590355960. Its totient is φ = 150727574450880.

The previous prime is 312221404220113. The next prime is 312221404220171. The reversal of 312221404220144 is 441022404122213.

It is a self number, because there is not a number n which added to its sum of digits gives 312221404220144.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336445478222 + ... + 336445479149.

It is an arithmetic number, because the mean of its divisors is an integer number (31289429517798).

Almost surely, 2^{312221404220144} is an apocalyptic number.

It is an amenable number.

312221404220144 is an abundant number, since it is smaller than the sum of its proper divisors (313567186135816).

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

312221404220144 is a wasteful number, since it uses less digits than its factorization.

312221404220144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672890957408 (or 672890957402 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 32.

Adding to 312221404220144 its reverse (441022404122213), we get a palindrome (753243808342357).

The spelling of 312221404220144 in words is "three hundred twelve trillion, two hundred twenty-one billion, four hundred four million, two hundred twenty thousand, one hundred forty-four".