99426721 has 2 divisors, whose sum is σ = 99426722. Its totient is φ = 99426720.

The previous prime is 99426713. The next prime is 99426731. The reversal of 99426721 is 12762499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77440000 + 21986721 = 8800^2 + 4689^2 .

It is an emirp because it is prime and its reverse (12762499) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99426721 - 2³ = 99426713 is a prime.

It is not a weakly prime, because it can be changed into another prime (99426731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49713360 + 49713361.

It is an arithmetic number, because the mean of its divisors is an integer number (49713361).

Almost surely, 2^99426721 is an apocalyptic number.

It is an amenable number.

99426721 is a deficient number, since it is larger than the sum of its proper divisors (1).

99426721 is an equidigital number, since it uses as much as digits as its factorization.

99426721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 40.

The square root of 99426721 is about 9971.2948507202. The cubic root of 99426721 is about 463.2702078600.

The spelling of 99426721 in words is "ninety-nine million, four hundred twenty-six thousand, seven hundred twenty-one".