99121971641 has 8 divisors (see below), whose sum is σ = 123580640064. Its totient is φ = 77237899920.

The previous prime is 99121971629. The next prime is 99121971649. The reversal of 99121971641 is 14617912199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99121971641 - 2¹⁰ = 99121970617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99121971641.

It is not an unprimeable number, because it can be changed into a prime (99121971649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 643649090 + ... + 643649243.

It is an arithmetic number, because the mean of its divisors is an integer number (15447580008).

Almost surely, 2^99121971641 is an apocalyptic number.

It is an amenable number.

99121971641 is a deficient number, since it is larger than the sum of its proper divisors (24458668423).

99121971641 is a wasteful number, since it uses less digits than its factorization.

99121971641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287298351.

The product of its digits is 244944, while the sum is 50.

The spelling of 99121971641 in words is "ninety-nine billion, one hundred twenty-one million, nine hundred seventy-one thousand, six hundred forty-one".