31323211112220 has 96 divisors (see below), whose sum is σ = 89647555286016. Its totient is φ = 8168153760000.

The previous prime is 31323211112213. The next prime is 31323211112251. The reversal of 31323211112220 is 2221111232313.

It is a super-2 number, since 2×31323211112220² (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 31 ways as a sum of consecutive naturals, for example, 1440531 + ... + 8044970.

It is an arithmetic number, because the mean of its divisors is an integer number (933828700896).

Almost surely, 2^{31323211112220} is an apocalyptic number.

31323211112220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31323211112220 is an abundant number, since it is smaller than the sum of its proper divisors (58324344173796).

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

31323211112220 is a wasteful number, since it uses less digits than its factorization.

31323211112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9486731 (or 9486729 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 31323211112220 its reverse (2221111232313), we get a palindrome (33544322344533).

The spelling of 31323211112220 in words is "thirty-one trillion, three hundred twenty-three billion, two hundred eleven million, one hundred twelve thousand, two hundred twenty".