97188021 has 48 divisors (see below), whose sum is σ = 172432000. Its totient is φ = 52581312.

The previous prime is 97188017. The next prime is 97188029. The reversal of 97188021 is 12088179.

It is not a de Polignac number, because 97188021 - 2² = 97188017 is a prime.

It is a super-2 number, since 2×97188021² = 18891022851792882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97188029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 57825 + ... + 59481.

Almost surely, 2^97188021 is an apocalyptic number.

It is an amenable number.

97188021 is a deficient number, since it is larger than the sum of its proper divisors (75243979).

97188021 is a wasteful number, since it uses less digits than its factorization.

97188021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703 (or 1686 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 97188021 is about 9858.3985007708. The cubic root of 97188021 is about 459.7667705517.

The spelling of 97188021 in words is "ninety-seven million, one hundred eighty-eight thousand, twenty-one".