21211023191 has 2 divisors, whose sum is σ = 21211023192. Its totient is φ = 21211023190.

The previous prime is 21211023157. The next prime is 21211023193. The reversal of 21211023191 is 19132011212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21211023191 - 2¹⁴ = 21211006807 is a prime.

It is a Sophie Germain prime.

Together with 21211023193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211023193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605511595 + 10605511596.

It is an arithmetic number, because the mean of its divisors is an integer number (10605511596).

Almost surely, 2^21211023191 is an apocalyptic number.

21211023191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211023191 is an equidigital number, since it uses as much as digits as its factorization.

21211023191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 23.

The spelling of 21211023191 in words is "twenty-one billion, two hundred eleven million, twenty-three thousand, one hundred ninety-one".