99820621 has 16 divisors (see below), whose sum is σ = 107495424. Its totient is φ = 92468464.

The previous prime is 99820597. The next prime is 99820649. The reversal of 99820621 is 12602899.

It is not a de Polignac number, because 99820621 - 2²¹ = 97723469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99820681) 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, 115236 + ... + 116098.

It is an arithmetic number, because the mean of its divisors is an integer number (6718464).

Almost surely, 2^99820621 is an apocalyptic number.

It is an amenable number.

99820621 is a deficient number, since it is larger than the sum of its proper divisors (7674803).

99820621 is a wasteful number, since it uses less digits than its factorization.

99820621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 99820621 is about 9991.0270242853. The cubic root of 99820621 is about 463.8811827284.

The spelling of 99820621 in words is "ninety-nine million, eight hundred twenty thousand, six hundred twenty-one".