99121372 has 48 divisors (see below), whose sum is σ = 204960448. Its totient is φ = 41057280.

The previous prime is 99121369. The next prime is 99121381. The reversal of 99121372 is 27312199.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249478 + ... + 249874.

Almost surely, 2^99121372 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99121372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102480224).

99121372 is an abundant number, since it is smaller than the sum of its proper divisors (105839076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99121372 is a wasteful number, since it uses less digits than its factorization.

99121372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686 (or 684 counting only the distinct ones).

The product of its digits is 6804, while the sum is 34.

The square root of 99121372 is about 9955.9716753313. The cubic root of 99121372 is about 462.7954724557.

The spelling of 99121372 in words is "ninety-nine million, one hundred twenty-one thousand, three hundred seventy-two".