83553021 has 6 divisors (see below), whose sum is σ = 120687710. Its totient is φ = 55702008.

The previous prime is 83552947. The next prime is 83553037. The reversal of 83553021 is 12035538.

83553021 is a `hidden beast` number, since 8 + 355 + 302 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 46172025 + 37380996 = 6795^2 + 6114^2 .

It is not a de Polignac number, because 83553021 - 2⁷ = 83552893 is a prime.

It is a super-2 number, since 2×83553021² = 13962214636452882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83553061) 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 5 ways as a sum of consecutive naturals, for example, 4641826 + ... + 4641843.

Almost surely, 2^83553021 is an apocalyptic number.

It is an amenable number.

83553021 is a deficient number, since it is larger than the sum of its proper divisors (37134689).

83553021 is a wasteful number, since it uses less digits than its factorization.

83553021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9283675 (or 9283672 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 83553021 is about 9140.7341608866. The cubic root of 83553021 is about 437.1737252785.

Adding to 83553021 its reverse (12035538), we get a palindrome (95588559).

The spelling of 83553021 in words is "eighty-three million, five hundred fifty-three thousand, twenty-one".