31300022021 has 4 divisors (see below), whose sum is σ = 31316083500. Its totient is φ = 31283960544.

The previous prime is 31300021979. The next prime is 31300022023. The reversal of 31300022021 is 12022000313.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24090144100 + 7209877921 = 155210^2 + 84911^2 .

It is a cyclic number.

It is not a de Polignac number, because 31300022021 - 2²⁶ = 31232913157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31300021987 and 31300022005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31300022023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8027816 + ... + 8031713.

It is an arithmetic number, because the mean of its divisors is an integer number (7829020875).

Almost surely, 2^31300022021 is an apocalyptic number.

It is an amenable number.

31300022021 is a deficient number, since it is larger than the sum of its proper divisors (16061479).

31300022021 is a wasteful number, since it uses less digits than its factorization.

31300022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16061478.

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

Adding to 31300022021 its reverse (12022000313), we get a palindrome (43322022334).

The spelling of 31300022021 in words is "thirty-one billion, three hundred million, twenty-two thousand, twenty-one".