99120111221 has 4 divisors (see below), whose sum is σ = 104336959200. Its totient is φ = 93903263244.

The previous prime is 99120111199. The next prime is 99120111241. The reversal of 99120111221 is 12211102199.

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 99120111221 - 2¹⁴ = 99120094837 is a prime.

It is a super-2 number, since 2×99120111221² (a number of 23 digits) 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 (99120111241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2608423961 + ... + 2608423998.

It is an arithmetic number, because the mean of its divisors is an integer number (26084239800).

Almost surely, 2^99120111221 is an apocalyptic number.

It is an amenable number.

99120111221 is a deficient number, since it is larger than the sum of its proper divisors (5216847979).

99120111221 is a wasteful number, since it uses less digits than its factorization.

99120111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5216847978.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 99120111221 in words is "ninety-nine billion, one hundred twenty million, one hundred eleven thousand, two hundred twenty-one".