21726871259 has 2 divisors, whose sum is σ = 21726871260. Its totient is φ = 21726871258.

The previous prime is 21726871219. The next prime is 21726871297. The reversal of 21726871259 is 95217862712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21726871259 is a prime.

It is not a weakly prime, because it can be changed into another prime (21726871219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10863435629 + 10863435630.

It is an arithmetic number, because the mean of its divisors is an integer number (10863435630).

Almost surely, 2^21726871259 is an apocalyptic number.

21726871259 is a deficient number, since it is larger than the sum of its proper divisors (1).

21726871259 is an equidigital number, since it uses as much as digits as its factorization.

21726871259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 50.

The spelling of 21726871259 in words is "twenty-one billion, seven hundred twenty-six million, eight hundred seventy-one thousand, two hundred fifty-nine".