21121001110091 has 8 divisors (see below), whose sum is σ = 21136284985200. Its totient is φ = 21105722504160.

The previous prime is 21121001110081. The next prime is 21121001110123. The reversal of 21121001110091 is 19001110012112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21121001110091 - 2²² = 21120996915787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121001110081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6720140 + ... + 9348918.

It is an arithmetic number, because the mean of its divisors is an integer number (2642035623150).

Almost surely, 2^{21121001110091} is an apocalyptic number.

21121001110091 is a deficient number, since it is larger than the sum of its proper divisors (15283875109).

21121001110091 is a wasteful number, since it uses less digits than its factorization.

21121001110091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2634589.

The product of its (nonzero) digits is 36, while the sum is 20.

The spelling of 21121001110091 in words is "twenty-one trillion, one hundred twenty-one billion, one million, one hundred ten thousand, ninety-one".