99251321 has 16 divisors (see below), whose sum is σ = 114879744. Its totient is φ = 84927744.

The previous prime is 99251303. The next prime is 99251323. The reversal of 99251321 is 12315299.

It is a cyclic number.

It is not a de Polignac number, because 99251321 - 2¹⁰ = 99250297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99251323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11456 + ... + 18158.

It is an arithmetic number, because the mean of its divisors is an integer number (7179984).

Almost surely, 2^99251321 is an apocalyptic number.

It is an amenable number.

99251321 is a deficient number, since it is larger than the sum of its proper divisors (15628423).

99251321 is a wasteful number, since it uses less digits than its factorization.

99251321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6800.

The product of its digits is 4860, while the sum is 32.

The square root of 99251321 is about 9962.4957214545. The cubic root of 99251321 is about 462.9976271323.

The spelling of 99251321 in words is "ninety-nine million, two hundred fifty-one thousand, three hundred twenty-one".