21574425643 has 2 divisors, whose sum is σ = 21574425644. Its totient is φ = 21574425642.

The previous prime is 21574425599. The next prime is 21574425659. The reversal of 21574425643 is 34652447512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21574425643 - 2²⁵ = 21540871211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21574425643.

It is not a weakly prime, because it can be changed into another prime (21574428643) 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, 10787212821 + 10787212822.

It is an arithmetic number, because the mean of its divisors is an integer number (10787212822).

Almost surely, 2^21574425643 is an apocalyptic number.

21574425643 is a deficient number, since it is larger than the sum of its proper divisors (1).

21574425643 is an equidigital number, since it uses as much as digits as its factorization.

21574425643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 806400, while the sum is 43.

The spelling of 21574425643 in words is "twenty-one billion, five hundred seventy-four million, four hundred twenty-five thousand, six hundred forty-three".