21726462713 has 4 divisors (see below), whose sum is σ = 21988227408. Its totient is φ = 21464698020.

The previous prime is 21726462697. The next prime is 21726462731. The reversal of 21726462713 is 31726462712.

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 a cyclic number.

It is not a de Polignac number, because 21726462713 - 2⁴ = 21726462697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21726462733) 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, 130882223 + ... + 130882388.

It is an arithmetic number, because the mean of its divisors is an integer number (5497056852).

Almost surely, 2^21726462713 is an apocalyptic number.

It is an amenable number.

21726462713 is a deficient number, since it is larger than the sum of its proper divisors (261764695).

21726462713 is an equidigital number, since it uses as much as digits as its factorization.

21726462713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261764694.

The product of its digits is 169344, while the sum is 41.

Subtracting 21726462713 from its reverse (31726462712), we obtain a palindrome (9999999999).

The spelling of 21726462713 in words is "twenty-one billion, seven hundred twenty-six million, four hundred sixty-two thousand, seven hundred thirteen".