21112121222099 has 4 divisors (see below), whose sum is σ = 21427227509064. Its totient is φ = 20797014935136.

The previous prime is 21112121222063. The next prime is 21112121222147. The reversal of 21112121222099 is 99022212121112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21112121222099 - 2⁸ = 21112121221843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112121222039) 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, 157553143382 + ... + 157553143515.

It is an arithmetic number, because the mean of its divisors is an integer number (5356806877266).

Almost surely, 2^{21112121222099} is an apocalyptic number.

21112121222099 is a deficient number, since it is larger than the sum of its proper divisors (315106286965).

21112121222099 is an equidigital number, since it uses as much as digits as its factorization.

21112121222099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315106286964.

The product of its (nonzero) digits is 5184, while the sum is 35.

The spelling of 21112121222099 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, ninety-nine".