31323130211220 has 24 divisors (see below), whose sum is σ = 87704764591584. Its totient is φ = 8352834722976.

The previous prime is 31323130211183. The next prime is 31323130211249. The reversal of 31323130211220 is 2211203132313.

It is a super-2 number, since 2×31323130211220² (a number of 28 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, 261026085034 + ... + 261026085153.

It is an arithmetic number, because the mean of its divisors is an integer number (3654365191316).

Almost surely, 2^{31323130211220} is an apocalyptic number.

31323130211220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31323130211220 is an abundant number, since it is smaller than the sum of its proper divisors (56381634380364).

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

31323130211220 is a wasteful number, since it uses less digits than its factorization.

31323130211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522052170199 (or 522052170197 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 31323130211220 its reverse (2211203132313), we get a palindrome (33534333343533).

The spelling of 31323130211220 in words is "thirty-one trillion, three hundred twenty-three billion, one hundred thirty million, two hundred eleven thousand, two hundred twenty".