21110102010191 has 4 divisors (see below), whose sum is σ = 21110118410400. Its totient is φ = 21110085609984.

The previous prime is 21110102010187. The next prime is 21110102010229. The reversal of 21110102010191 is 19101020101112.

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 21110102010191 - 2² = 21110102010187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110102010161) 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, 6087986 + ... + 8904143.

It is an arithmetic number, because the mean of its divisors is an integer number (5277529602600).

Almost surely, 2^{21110102010191} is an apocalyptic number.

21110102010191 is a deficient number, since it is larger than the sum of its proper divisors (16400209).

21110102010191 is a wasteful number, since it uses less digits than its factorization.

21110102010191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16400208.

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

The spelling of 21110102010191 in words is "twenty-one trillion, one hundred ten billion, one hundred two million, ten thousand, one hundred ninety-one".