21524412191 has 2 divisors, whose sum is σ = 21524412192. Its totient is φ = 21524412190.

The previous prime is 21524412179. The next prime is 21524412193. The reversal of 21524412191 is 19121442512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21524412191 is a prime.

Together with 21524412193, 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 (21524412193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10762206095 + 10762206096.

It is an arithmetic number, because the mean of its divisors is an integer number (10762206096).

Almost surely, 2^21524412191 is an apocalyptic number.

21524412191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21524412191 is an equidigital number, since it uses as much as digits as its factorization.

21524412191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 32.

The spelling of 21524412191 in words is "twenty-one billion, five hundred twenty-four million, four hundred twelve thousand, one hundred ninety-one".