31120003220 has 48 divisors (see below), whose sum is σ = 66671629248. Its totient is φ = 12198574080.

The previous prime is 31120003219. The next prime is 31120003303. The reversal of 31120003220 is 2230002113.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31120003195 and 31120003204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198455 + ... + 318785.

It is an arithmetic number, because the mean of its divisors is an integer number (1388992276).

Almost surely, 2^31120003220 is an apocalyptic number.

It is an amenable number.

31120003220 is an abundant number, since it is smaller than the sum of its proper divisors (35551626028).

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

31120003220 is a wasteful number, since it uses less digits than its factorization.

31120003220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120600 (or 120598 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 31120003220 its reverse (2230002113), we get a palindrome (33350005333).

The spelling of 31120003220 in words is "thirty-one billion, one hundred twenty million, three thousand, two hundred twenty".