31120033220 has 12 divisors (see below), whose sum is σ = 65352069804. Its totient is φ = 12448013280.

The previous prime is 31120033211. The next prime is 31120033261. The reversal of 31120033220 is 2233002113.

It can be written as a sum of positive squares in 2 ways, for example, as 24701780224 + 6418252996 = 157168^2 + 80114^2 .

It is a super-2 number, since 2×31120033220² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 778000811 + ... + 778000850.

It is an arithmetic number, because the mean of its divisors is an integer number (5446005817).

Almost surely, 2^31120033220 is an apocalyptic number.

It is an amenable number.

31120033220 is an abundant number, since it is smaller than the sum of its proper divisors (34232036584).

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

31120033220 is a wasteful number, since it uses less digits than its factorization.

31120033220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556001670 (or 1556001668 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 31120033220 its reverse (2233002113), we get a palindrome (33353035333).

The spelling of 31120033220 in words is "thirty-one billion, one hundred twenty million, thirty-three thousand, two hundred twenty".