99421919 has 2 divisors, whose sum is σ = 99421920. Its totient is φ = 99421918.

The previous prime is 99421897. The next prime is 99421937. The reversal of 99421919 is 91912499.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99421919 is a prime.

It is a super-3 number, since 3×99421919³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99421919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99421969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49710959 + 49710960.

It is an arithmetic number, because the mean of its divisors is an integer number (49710960).

Almost surely, 2^99421919 is an apocalyptic number.

99421919 is a deficient number, since it is larger than the sum of its proper divisors (1).

99421919 is an equidigital number, since it uses as much as digits as its factorization.

99421919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 44.

The square root of 99421919 is about 9971.0540566181. The cubic root of 99421919 is about 463.2627495720.

The spelling of 99421919 in words is "ninety-nine million, four hundred twenty-one thousand, nine hundred nineteen".