31112200021 has 16 divisors (see below), whose sum is σ = 37692635904. Its totient is φ = 25069411584.

The previous prime is 31112199983. The next prime is 31112200039. The reversal of 31112200021 is 12000221113.

It is not a de Polignac number, because 31112200021 - 2⁷ = 31112199893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31112199974 and 31112200010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31112200081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51745 + ... + 254758.

It is an arithmetic number, because the mean of its divisors is an integer number (2355789744).

Almost surely, 2^31112200021 is an apocalyptic number.

It is an amenable number.

31112200021 is a deficient number, since it is larger than the sum of its proper divisors (6580435883).

31112200021 is a wasteful number, since it uses less digits than its factorization.

31112200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307380.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 31112200021 its reverse (12000221113), we get a palindrome (43112421134).

The spelling of 31112200021 in words is "thirty-one billion, one hundred twelve million, two hundred thousand, twenty-one".