99121321 has 8 divisors (see below), whose sum is σ = 109229120. Its totient is φ = 89368272.

The previous prime is 99121307. The next prime is 99121343. The reversal of 99121321 is 12312199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99121321 - 2⁹ = 99120809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99121321.

It is not an unprimeable number, because it can be changed into a prime (99121381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88101 + ... + 89218.

It is an arithmetic number, because the mean of its divisors is an integer number (13653640).

Almost surely, 2^99121321 is an apocalyptic number.

It is an amenable number.

99121321 is a deficient number, since it is larger than the sum of its proper divisors (10107799).

99121321 is a wasteful number, since it uses less digits than its factorization.

99121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177375.

The product of its digits is 972, while the sum is 28.

The square root of 99121321 is about 9955.9691140541. The cubic root of 99121321 is about 462.7953930831.

The spelling of 99121321 in words is "ninety-nine million, one hundred twenty-one thousand, three hundred twenty-one".