99921911 has 2 divisors, whose sum is σ = 99921912.
Its totient is φ = 99921910.
The previous prime is 99921883. The next prime is 99921919. The reversal of 99921911 is 11912999.
It is a happy number.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 99921911 - 26 = 99921847 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (99921919) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49960955 + 49960956.
It is an arithmetic number, because the mean of its divisors is an integer number (49960956).
Almost surely, 299921911 is an apocalyptic number.
99921911 is a deficient number, since it is larger than the sum of its proper divisors (1).
99921911 is an equidigital number, since it uses as much as digits as its factorization.
99921911 is an evil number, because the sum of its binary digits is even.
The product of its digits is 13122, while the sum is 41.
The square root of 99921911 is about 9996.0947874658.
The cubic root of 99921911 is about 464.0380328887.
The spelling of 99921911 in words is "ninety-nine million, nine hundred twenty-one thousand, nine hundred eleven".