21765936583 has 2 divisors, whose sum is σ = 21765936584. Its totient is φ = 21765936582.

The previous prime is 21765936527. The next prime is 21765936601. The reversal of 21765936583 is 38563956712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21765936583 - 2¹³ = 21765928391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21765936503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10882968291 + 10882968292.

It is an arithmetic number, because the mean of its divisors is an integer number (10882968292).

Almost surely, 2^21765936583 is an apocalyptic number.

21765936583 is a deficient number, since it is larger than the sum of its proper divisors (1).

21765936583 is an equidigital number, since it uses as much as digits as its factorization.

21765936583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8164800, while the sum is 55.

The spelling of 21765936583 in words is "twenty-one billion, seven hundred sixty-five million, nine hundred thirty-six thousand, five hundred eighty-three".