21101122110091 has 4 divisors (see below), whose sum is σ = 21101171152312. Its totient is φ = 21101073067872.

The previous prime is 21101122110067. The next prime is 21101122110119. The reversal of 21101122110091 is 19001122110112.

It is a happy number.

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 21101122110091 - 2²⁹ = 21100585239179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101122110391) 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, 23869950 + ... + 24738163.

It is an arithmetic number, because the mean of its divisors is an integer number (5275292788078).

Almost surely, 2^{21101122110091} is an apocalyptic number.

21101122110091 is a deficient number, since it is larger than the sum of its proper divisors (49042221).

21101122110091 is an equidigital number, since it uses as much as digits as its factorization.

21101122110091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49042220.

The product of its (nonzero) digits is 72, while the sum is 22.

The spelling of 21101122110091 in words is "twenty-one trillion, one hundred one billion, one hundred twenty-two million, one hundred ten thousand, ninety-one".