31112300021 has 16 divisors (see below), whose sum is σ = 34540758720. Its totient is φ = 27784542720.

The previous prime is 31112299997. The next prime is 31112300027. The reversal of 31112300021 is 12000321113.

It is a de Polignac number, because none of the positive numbers 2^k-31112300021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31112299969 and 31112300005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31112300027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 926501 + ... + 959493.

It is an arithmetic number, because the mean of its divisors is an integer number (2158797420).

Almost surely, 2^31112300021 is an apocalyptic number.

It is an amenable number.

31112300021 is a deficient number, since it is larger than the sum of its proper divisors (3428458699).

31112300021 is a wasteful number, since it uses less digits than its factorization.

31112300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34516.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 31112300021 its reverse (12000321113), we get a palindrome (43112621134).

It can be divided in two parts, 31112 and 300021, that added together give a palindrome (331133).

The spelling of 31112300021 in words is "thirty-one billion, one hundred twelve million, three hundred thousand, twenty-one".