21310444459 has 2 divisors, whose sum is σ = 21310444460. Its totient is φ = 21310444458.

The previous prime is 21310444387. The next prime is 21310444513. The reversal of 21310444459 is 95444401312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21310444459 - 2²³ = 21302055851 is a prime.

It is not a weakly prime, because it can be changed into another prime (21310424459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655222229 + 10655222230.

It is an arithmetic number, because the mean of its divisors is an integer number (10655222230).

Almost surely, 2^21310444459 is an apocalyptic number.

21310444459 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310444459 is an equidigital number, since it uses as much as digits as its factorization.

21310444459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 21310444459 in words is "twenty-one billion, three hundred ten million, four hundred forty-four thousand, four hundred fifty-nine".