97908021 has 10 divisors (see below), whose sum is σ = 146257782. Its totient is φ = 65271960.

The previous prime is 97908011. The next prime is 97908029. The reversal of 97908021 is 12080979.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 55800900 + 42107121 = 7470^2 + 6489^2 .

It is not a de Polignac number, because 97908021 - 2¹⁰ = 97906997 is a prime.

It is a super-2 number, since 2×97908021² = 19171961152272882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97908029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 604290 + ... + 604451.

Almost surely, 2^97908021 is an apocalyptic number.

It is an amenable number.

97908021 is a deficient number, since it is larger than the sum of its proper divisors (48349761).

97908021 is a wasteful number, since it uses less digits than its factorization.

97908021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208753 (or 1208744 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 97908021 is about 9894.8482050004. The cubic root of 97908021 is about 460.8993448321.

The spelling of 97908021 in words is "ninety-seven million, nine hundred eight thousand, twenty-one".