99970868921 has 16 divisors (see below), whose sum is σ = 125475523200. Its totient is φ = 77376554880.

The previous prime is 99970868917. The next prime is 99970868929. The reversal of 99970868921 is 12986807999.

It is a cyclic number.

It is not a de Polignac number, because 99970868921 - 2² = 99970868917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99970868929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4345316 + ... + 4368261.

It is an arithmetic number, because the mean of its divisors is an integer number (7842220200).

Almost surely, 2^99970868921 is an apocalyptic number.

It is an amenable number.

99970868921 is a deficient number, since it is larger than the sum of its proper divisors (25504654279).

99970868921 is a wasteful number, since it uses less digits than its factorization.

99970868921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8713744.

The product of its (nonzero) digits is 35271936, while the sum is 68.

The spelling of 99970868921 in words is "ninety-nine billion, nine hundred seventy million, eight hundred sixty-eight thousand, nine hundred twenty-one".