31223432132220 has 24 divisors (see below), whose sum is σ = 87425609970384. Its totient is φ = 8326248568576.

The previous prime is 31223432132197. The next prime is 31223432132231. The reversal of 31223432132220 is 2223123432213.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 260195267709 + ... + 260195267828.

It is an arithmetic number, because the mean of its divisors is an integer number (3642733748766).

Almost surely, 2^{31223432132220} is an apocalyptic number.

31223432132220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31223432132220 is an abundant number, since it is smaller than the sum of its proper divisors (56202177838164).

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

31223432132220 is a wasteful number, since it uses less digits than its factorization.

31223432132220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520390535549 (or 520390535547 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 30.

Adding to 31223432132220 its reverse (2223123432213), we get a palindrome (33446555564433).

The spelling of 31223432132220 in words is "thirty-one trillion, two hundred twenty-three billion, four hundred thirty-two million, one hundred thirty-two thousand, two hundred twenty".