21739040567 has 2 divisors, whose sum is σ = 21739040568. Its totient is φ = 21739040566.

The previous prime is 21739040527. The next prime is 21739040573. The reversal of 21739040567 is 76504093712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21739040567 - 2²⁰ = 21737991991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21739040507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10869520283 + 10869520284.

It is an arithmetic number, because the mean of its divisors is an integer number (10869520284).

Almost surely, 2^21739040567 is an apocalyptic number.

21739040567 is a deficient number, since it is larger than the sum of its proper divisors (1).

21739040567 is an equidigital number, since it uses as much as digits as its factorization.

21739040567 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 44.

The spelling of 21739040567 in words is "twenty-one billion, seven hundred thirty-nine million, forty thousand, five hundred sixty-seven".