21101202020191 has 2 divisors, whose sum is σ = 21101202020192. Its totient is φ = 21101202020190.

The previous prime is 21101202020113. The next prime is 21101202020267. The reversal of 21101202020191 is 19102020210112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21101202020191 - 2²⁹ = 21100665149279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101002020191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550601010095 + 10550601010096.

It is an arithmetic number, because the mean of its divisors is an integer number (10550601010096).

Almost surely, 2^{21101202020191} is an apocalyptic number.

21101202020191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101202020191 is an equidigital number, since it uses as much as digits as its factorization.

21101202020191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 21101202020191 in words is "twenty-one trillion, one hundred one billion, two hundred two million, twenty thousand, one hundred ninety-one".