83572021 has 12 divisors (see below), whose sum is σ = 90768000. Its totient is φ = 76911120.

The previous prime is 83572019. The next prime is 83572067. The reversal of 83572021 is 12027538.

It is not a de Polignac number, because 83572021 - 2¹ = 83572019 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 (83572081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83836 + ... + 84826.

It is an arithmetic number, because the mean of its divisors is an integer number (7564000).

Almost surely, 2^83572021 is an apocalyptic number.

It is an amenable number.

83572021 is a deficient number, since it is larger than the sum of its proper divisors (7195979).

83572021 is a wasteful number, since it uses less digits than its factorization.

83572021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1516 (or 1503 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 83572021 is about 9141.7734056363. The cubic root of 83572021 is about 437.2068606104.

Adding to 83572021 its reverse (12027538), we get a palindrome (95599559).

The spelling of 83572021 in words is "eighty-three million, five hundred seventy-two thousand, twenty-one".