31112202001220 has 12 divisors (see below), whose sum is σ = 65335624202604. Its totient is φ = 12444880800480.

The previous prime is 31112202001187. The next prime is 31112202001249. The reversal of 31112202001220 is 2210020221113.

It can be written as a sum of positive squares in 2 ways, for example, as 5777831378944 + 25334370622276 = 2403712^2 + 5033326^2 .

It is a super-2 number, since 2×31112202001220² (a number of 28 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, 777805050011 + ... + 777805050050.

It is an arithmetic number, because the mean of its divisors is an integer number (5444635350217).

Almost surely, 2^{31112202001220} is an apocalyptic number.

It is an amenable number.

31112202001220 is an abundant number, since it is smaller than the sum of its proper divisors (34223422201384).

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

31112202001220 is a wasteful number, since it uses less digits than its factorization.

31112202001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555610100070 (or 1555610100068 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 31112202001220 its reverse (2210020221113), we get a palindrome (33322222222333).

The spelling of 31112202001220 in words is "thirty-one trillion, one hundred twelve billion, two hundred two million, one thousand, two hundred twenty".