99921347 has 2 divisors, whose sum is σ = 99921348. Its totient is φ = 99921346.

The previous prime is 99921331. The next prime is 99921373. The reversal of 99921347 is 74312999.

It is a weak prime.

It is an emirp because it is prime and its reverse (74312999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99921347 - 2⁴ = 99921331 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99921298 and 99921307.

It is not a weakly prime, because it can be changed into another prime (99921047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49960673 + 49960674.

It is an arithmetic number, because the mean of its divisors is an integer number (49960674).

Almost surely, 2^99921347 is an apocalyptic number.

99921347 is a deficient number, since it is larger than the sum of its proper divisors (1).

99921347 is an equidigital number, since it uses as much as digits as its factorization.

99921347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 44.

The square root of 99921347 is about 9996.0665764089. The cubic root of 99921347 is about 464.0371598138.

The spelling of 99921347 in words is "ninety-nine million, nine hundred twenty-one thousand, three hundred forty-seven".