31312220330220 has 96 divisors (see below), whose sum is σ = 87935194529280. Its totient is φ = 8325077207040.

The previous prime is 31312220330177. The next prime is 31312220330269. The reversal of 31312220330220 is 2203302221313.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 152796025 + ... + 153000815.

It is an arithmetic number, because the mean of its divisors is an integer number (915991609680).

Almost surely, 2^{31312220330220} is an apocalyptic number.

31312220330220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31312220330220 is an abundant number, since it is smaller than the sum of its proper divisors (56622974199060).

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

31312220330220 is a wasteful number, since it uses less digits than its factorization.

31312220330220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212375 (or 212373 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 31312220330220 its reverse (2203302221313), we get a palindrome (33515522551533).

The spelling of 31312220330220 in words is "thirty-one trillion, three hundred twelve billion, two hundred twenty million, three hundred thirty thousand, two hundred twenty".