31121222201220 has 24 divisors (see below), whose sum is σ = 87139422163584. Its totient is φ = 8298992586976.

The previous prime is 31121222201219. The next prime is 31121222201221. The reversal of 31121222201220 is 2210222212113.

It is an interprime number because it is at equal distance from previous prime (31121222201219) and next prime (31121222201221).

It is not an unprimeable number, because it can be changed into a prime (31121222201221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259343518284 + ... + 259343518403.

It is an arithmetic number, because the mean of its divisors is an integer number (3630809256816).

Almost surely, 2^{31121222201220} is an apocalyptic number.

31121222201220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31121222201220 is an abundant number, since it is smaller than the sum of its proper divisors (56018199962364).

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

31121222201220 is a wasteful number, since it uses less digits than its factorization.

31121222201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518687036699 (or 518687036697 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 31121222201220 its reverse (2210222212113), we get a palindrome (33331444413333).

The spelling of 31121222201220 in words is "thirty-one trillion, one hundred twenty-one billion, two hundred twenty-two million, two hundred one thousand, two hundred twenty".