99870621 has 8 divisors (see below), whose sum is σ = 133459200. Its totient is φ = 66431232.

The previous prime is 99870611. The next prime is 99870637. The reversal of 99870621 is 12607899.

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

It is not a de Polignac number, because 99870621 - 2⁹ = 99870109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99870611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35725 + ... + 38418.

It is an arithmetic number, because the mean of its divisors is an integer number (16682400).

Almost surely, 2^99870621 is an apocalyptic number.

It is an amenable number.

99870621 is a deficient number, since it is larger than the sum of its proper divisors (33588579).

99870621 is a wasteful number, since it uses less digits than its factorization.

99870621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74595.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 99870621 is about 9993.5289562797. The cubic root of 99870621 is about 463.9586222639.

The spelling of 99870621 in words is "ninety-nine million, eight hundred seventy thousand, six hundred twenty-one".