31522433021 has 4 divisors (see below), whose sum is σ = 32609413500. Its totient is φ = 30435452544.

The previous prime is 31522432993. The next prime is 31522433029. The reversal of 31522433021 is 12033422513.

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 19479784900 + 12042648121 = 139570^2 + 109739^2 .

It is a cyclic number.

It is not a de Polignac number, because 31522433021 - 2²⁶ = 31455324157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31522433029) 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, 543490196 + ... + 543490253.

It is an arithmetic number, because the mean of its divisors is an integer number (8152353375).

Almost surely, 2^31522433021 is an apocalyptic number.

It is an amenable number.

31522433021 is a deficient number, since it is larger than the sum of its proper divisors (1086980479).

31522433021 is a wasteful number, since it uses less digits than its factorization.

31522433021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086980478.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 31522433021 its reverse (12033422513), we get a palindrome (43555855534).

The spelling of 31522433021 in words is "thirty-one billion, five hundred twenty-two million, four hundred thirty-three thousand, twenty-one".