21020202011091 has 8 divisors (see below), whose sum is σ = 28304430431184. Its totient is φ = 13874720799200.

The previous prime is 21020202011077. The next prime is 21020202011099. The reversal of 21020202011091 is 19011020202012.

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 21020202011091 - 2³⁰ = 21019128269267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21020202011099) 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, 34686801696 + ... + 34686802301.

It is an arithmetic number, because the mean of its divisors is an integer number (3538053803898).

Almost surely, 2^{21020202011091} is an apocalyptic number.

21020202011091 is a deficient number, since it is larger than the sum of its proper divisors (7284228420093).

21020202011091 is a wasteful number, since it uses less digits than its factorization.

21020202011091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69373604101.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 21020202011091 in words is "twenty-one trillion, twenty billion, two hundred two million, eleven thousand, ninety-one".