21726871293 has 4 divisors (see below), whose sum is σ = 28969161728. Its totient is φ = 14484580860.

The previous prime is 21726871259. The next prime is 21726871297. The reversal of 21726871293 is 39217862712.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21726871293 - 2²⁸ = 21458435837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21726871297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3621145213 + ... + 3621145218.

It is an arithmetic number, because the mean of its divisors is an integer number (7242290432).

Almost surely, 2^21726871293 is an apocalyptic number.

It is an amenable number.

21726871293 is a deficient number, since it is larger than the sum of its proper divisors (7242290435).

21726871293 is an equidigital number, since it uses as much as digits as its factorization.

21726871293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7242290434.

The product of its digits is 508032, while the sum is 48.

The spelling of 21726871293 in words is "twenty-one billion, seven hundred twenty-six million, eight hundred seventy-one thousand, two hundred ninety-three".