21332013191 has 2 divisors, whose sum is σ = 21332013192. Its totient is φ = 21332013190.

The previous prime is 21332013173. The next prime is 21332013223. The reversal of 21332013191 is 19131023312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21332013191 - 2¹⁰ = 21332012167 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21332013191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21332013121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666006595 + 10666006596.

It is an arithmetic number, because the mean of its divisors is an integer number (10666006596).

Almost surely, 2^21332013191 is an apocalyptic number.

21332013191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21332013191 is an equidigital number, since it uses as much as digits as its factorization.

21332013191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The spelling of 21332013191 in words is "twenty-one billion, three hundred thirty-two million, thirteen thousand, one hundred ninety-one".