21583932439 has 2 divisors, whose sum is σ = 21583932440. Its totient is φ = 21583932438.

The previous prime is 21583932437. The next prime is 21583932451. The reversal of 21583932439 is 93423938512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21583932439 - 2¹ = 21583932437 is a prime.

It is a super-2 number, since 2×21583932439² (a number of 21 digits) contains 22 as substring.

Together with 21583932437, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21583932392 and 21583932401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21583932437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10791966219 + 10791966220.

It is an arithmetic number, because the mean of its divisors is an integer number (10791966220).

Almost surely, 2^21583932439 is an apocalyptic number.

21583932439 is a deficient number, since it is larger than the sum of its proper divisors (1).

21583932439 is an equidigital number, since it uses as much as digits as its factorization.

21583932439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 49.

The spelling of 21583932439 in words is "twenty-one billion, five hundred eighty-three million, nine hundred thirty-two thousand, four hundred thirty-nine".