21724063597 has 2 divisors, whose sum is σ = 21724063598. Its totient is φ = 21724063596.

The previous prime is 21724063541. The next prime is 21724063693. The reversal of 21724063597 is 79536042712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14779508041 + 6944555556 = 121571^2 + 83334^2 .

It is a cyclic number.

It is not a de Polignac number, because 21724063597 - 2²³ = 21715674989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21724063507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10862031798 + 10862031799.

It is an arithmetic number, because the mean of its divisors is an integer number (10862031799).

Almost surely, 2^21724063597 is an apocalyptic number.

It is an amenable number.

21724063597 is a deficient number, since it is larger than the sum of its proper divisors (1).

21724063597 is an equidigital number, since it uses as much as digits as its factorization.

21724063597 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 46.

The spelling of 21724063597 in words is "twenty-one billion, seven hundred twenty-four million, sixty-three thousand, five hundred ninety-seven".