21110202001091 has 32 divisors (see below), whose sum is σ = 24356727267840. Its totient is φ = 17921922969600.

The previous prime is 21110202001087. The next prime is 21110202001129. The reversal of 21110202001091 is 19010020201112.

It is a cyclic number.

It is not a de Polignac number, because 21110202001091 - 2² = 21110202001087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110202001391) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2432887445 + ... + 2432896121.

It is an arithmetic number, because the mean of its divisors is an integer number (761147727120).

Almost surely, 2^{21110202001091} is an apocalyptic number.

21110202001091 is a deficient number, since it is larger than the sum of its proper divisors (3246525266749).

21110202001091 is a wasteful number, since it uses less digits than its factorization.

21110202001091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13595.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 21110202001091 in words is "twenty-one trillion, one hundred ten billion, two hundred two million, one thousand, ninety-one".