99207421 has 4 divisors (see below), whose sum is σ = 99227392. Its totient is φ = 99187452.

The previous prime is 99207401. The next prime is 99207443. The reversal of 99207421 is 12470299.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99207421 - 2⁷ = 99207293 is a prime.

It is a super-2 number, since 2×99207421² = 19684224762942482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99207401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3940 + ... + 14626.

It is an arithmetic number, because the mean of its divisors is an integer number (24806848).

Almost surely, 2^99207421 is an apocalyptic number.

It is an amenable number.

99207421 is a deficient number, since it is larger than the sum of its proper divisors (19971).

99207421 is a wasteful number, since it uses less digits than its factorization.

99207421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19970.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 99207421 is about 9960.2922145889. The cubic root of 99207421 is about 462.9293540080.

The spelling of 99207421 in words is "ninety-nine million, two hundred seven thousand, four hundred twenty-one".