97911021 has 16 divisors (see below), whose sum is σ = 140817600. Its totient is φ = 60155520.

The previous prime is 97911019. The next prime is 97911061. The reversal of 97911021 is 12011979.

It is not a de Polignac number, because 97911021 - 2¹ = 97911019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97911021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97911061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28030 + ... + 31328.

It is an arithmetic number, because the mean of its divisors is an integer number (8801100).

Almost surely, 2^97911021 is an apocalyptic number.

It is an amenable number.

97911021 is a deficient number, since it is larger than the sum of its proper divisors (42906579).

97911021 is a wasteful number, since it uses less digits than its factorization.

97911021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4076.

The product of its (nonzero) digits is 1134, while the sum is 30.

The square root of 97911021 is about 9894.9997978777. Note that the first 3 decimals coincide. The cubic root of 97911021 is about 460.9040522568.

The spelling of 97911021 in words is "ninety-seven million, nine hundred eleven thousand, twenty-one".