99955021 has 2 divisors, whose sum is σ = 99955022. Its totient is φ = 99955020.

The previous prime is 99955003. The next prime is 99955043. The reversal of 99955021 is 12055999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94361796 + 5593225 = 9714^2 + 2365^2 .

It is a cyclic number.

It is not a de Polignac number, because 99955021 - 2⁵ = 99954989 is a prime.

It is a super-2 number, since 2×99955021² = 19982012446220882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99955061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49977510 + 49977511.

It is an arithmetic number, because the mean of its divisors is an integer number (49977511).

Almost surely, 2^99955021 is an apocalyptic number.

It is an amenable number.

99955021 is a deficient number, since it is larger than the sum of its proper divisors (1).

99955021 is an equidigital number, since it uses as much as digits as its factorization.

99955021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36450, while the sum is 40.

The square root of 99955021 is about 9997.7507970543. The cubic root of 99955021 is about 464.0892815835.

The spelling of 99955021 in words is "ninety-nine million, nine hundred fifty-five thousand, twenty-one".