99211920 has 80 divisors (see below), whose sum is σ = 323759040. Its totient is φ = 25062912.

The previous prime is 99211907. The next prime is 99211927. The reversal of 99211920 is 2911299.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (99211927) 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, 6319 + ... + 15438.

It is an arithmetic number, because the mean of its divisors is an integer number (4046988).

Almost surely, 2^99211920 is an apocalyptic number.

It is an amenable number.

99211920 is an abundant number, since it is smaller than the sum of its proper divisors (224547120).

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

99211920 is a wasteful number, since it uses less digits than its factorization.

99211920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21792 (or 21786 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 99211920 is about 9960.5180588160. The cubic root of 99211920 is about 462.9363517631.

The spelling of 99211920 in words is "ninety-nine million, two hundred eleven thousand, nine hundred twenty".