21323211191 has 2 divisors, whose sum is σ = 21323211192. Its totient is φ = 21323211190.

The previous prime is 21323211139. The next prime is 21323211229. The reversal of 21323211191 is 19111232312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21323211191 - 2²⁶ = 21256102327 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21323211191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21323211691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661605595 + 10661605596.

It is an arithmetic number, because the mean of its divisors is an integer number (10661605596).

Almost surely, 2^21323211191 is an apocalyptic number.

21323211191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323211191 is an equidigital number, since it uses as much as digits as its factorization.

21323211191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 26.

The spelling of 21323211191 in words is "twenty-one billion, three hundred twenty-three million, two hundred eleven thousand, one hundred ninety-one".