21184842479 has 2 divisors, whose sum is σ = 21184842480. Its totient is φ = 21184842478.

The previous prime is 21184842457. The next prime is 21184842487. The reversal of 21184842479 is 97424848112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21184842479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21180842479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10592421239 + 10592421240.

It is an arithmetic number, because the mean of its divisors is an integer number (10592421240).

Almost surely, 2^21184842479 is an apocalyptic number.

21184842479 is a deficient number, since it is larger than the sum of its proper divisors (1).

21184842479 is an equidigital number, since it uses as much as digits as its factorization.

21184842479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1032192, while the sum is 50.

The spelling of 21184842479 in words is "twenty-one billion, one hundred eighty-four million, eight hundred forty-two thousand, four hundred seventy-nine".