99926921 has 2 divisors, whose sum is σ = 99926922.
Its totient is φ = 99926920.
The previous prime is 99926851. The next prime is 99926923. The reversal of 99926921 is 12962999.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 99900025 + 26896 = 9995^2 + 164^2
It is a cyclic number.
It is not a de Polignac number, because 99926921 - 218 = 99664777 is a prime.
Together with 99926923, it forms a pair of twin primes.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (99926923) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49963460 + 49963461.
It is an arithmetic number, because the mean of its divisors is an integer number (49963461).
Almost surely, 299926921 is an apocalyptic number.
It is an amenable number.
99926921 is a deficient number, since it is larger than the sum of its proper divisors (1).
99926921 is an equidigital number, since it uses as much as digits as its factorization.
99926921 is an evil number, because the sum of its binary digits is even.
The product of its digits is 157464, while the sum is 47.
The square root of 99926921 is about 9996.3453821884.
The cubic root of 99926921 is about 464.0457882504.
The spelling of 99926921 in words is "ninety-nine million, nine hundred twenty-six thousand, nine hundred twenty-one".