99214721 has 2 divisors, whose sum is σ = 99214722. Its totient is φ = 99214720.

The previous prime is 99214699. The next prime is 99214747. The reversal of 99214721 is 12741299.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92640625 + 6574096 = 9625^2 + 2564^2 .

It is an emirp because it is prime and its reverse (12741299) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99214721 is a prime.

It is not a weakly prime, because it can be changed into another prime (99219721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49607360 + 49607361.

It is an arithmetic number, because the mean of its divisors is an integer number (49607361).

Almost surely, 2^99214721 is an apocalyptic number.

It is an amenable number.

99214721 is a deficient number, since it is larger than the sum of its proper divisors (1).

99214721 is an equidigital number, since it uses as much as digits as its factorization.

99214721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 35.

The square root of 99214721 is about 9960.6586629600. The cubic root of 99214721 is about 462.9407083381.

The spelling of 99214721 in words is "ninety-nine million, two hundred fourteen thousand, seven hundred twenty-one".