99897571621 has 8 divisors (see below), whose sum is σ = 104797843200. Its totient is φ = 95094335280.

The previous prime is 99897571607. The next prime is 99897571637. The reversal of 99897571621 is 12617579899.

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 99897571621 - 2¹⁷ = 99897440549 is a prime.

It is a pancake number, because a pancake can be divided into 99897571621 parts by 446984 straight cuts.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99897571661) 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, 24256701 + ... + 24260818.

It is an arithmetic number, because the mean of its divisors is an integer number (13099730400).

Almost surely, 2^99897571621 is an apocalyptic number.

It is an amenable number.

99897571621 is a deficient number, since it is larger than the sum of its proper divisors (4900271579).

99897571621 is a wasteful number, since it uses less digits than its factorization.

99897571621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48517619.

The product of its digits is 17146080, while the sum is 64.

The spelling of 99897571621 in words is "ninety-nine billion, eight hundred ninety-seven million, five hundred seventy-one thousand, six hundred twenty-one".