21259597753 has 2 divisors, whose sum is σ = 21259597754. Its totient is φ = 21259597752.

The previous prime is 21259597699. The next prime is 21259597759. The reversal of 21259597753 is 35779595212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20624406544 + 635191209 = 143612^2 + 25203^2 .

It is a cyclic number.

It is not a de Polignac number, because 21259597753 - 2³³ = 12669663161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21259597694 and 21259597703.

It is not a weakly prime, because it can be changed into another prime (21259597759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10629798876 + 10629798877.

It is an arithmetic number, because the mean of its divisors is an integer number (10629798877).

Almost surely, 2^21259597753 is an apocalyptic number.

It is an amenable number.

21259597753 is a deficient number, since it is larger than the sum of its proper divisors (1).

21259597753 is an equidigital number, since it uses as much as digits as its factorization.

21259597753 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5953500, while the sum is 55.

The spelling of 21259597753 in words is "twenty-one billion, two hundred fifty-nine million, five hundred ninety-seven thousand, seven hundred fifty-three".