99921373 has 2 divisors, whose sum is σ = 99921374.
Its totient is φ = 99921372.
The previous prime is 99921347. The next prime is 99921383. The reversal of 99921373 is 37312999.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 51451929 + 48469444 = 7173^2 + 6962^2
It is an emirp because it is prime and its reverse (37312999) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 99921373 - 225 = 66366941 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (99921313) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49960686 + 49960687.
It is an arithmetic number, because the mean of its divisors is an integer number (49960687).
Almost surely, 299921373 is an apocalyptic number.
It is an amenable number.
99921373 is a deficient number, since it is larger than the sum of its proper divisors (1).
99921373 is an equidigital number, since it uses as much as digits as its factorization.
99921373 is an evil number, because the sum of its binary digits is even.
The product of its digits is 91854, while the sum is 43.
The square root of 99921373 is about 9996.0678769204.
The cubic root of 99921373 is about 464.0372000620.
The spelling of 99921373 in words is "ninety-nine million, nine hundred twenty-one thousand, three hundred seventy-three".