21726369455 has 32 divisors (see below), whose sum is σ = 30517094400. Its totient is φ = 14842789920.

The previous prime is 21726369433. The next prime is 21726369463. The reversal of 21726369455 is 55496362712.

It is not a de Polignac number, because 21726369455 - 2⁸ = 21726369199 is a prime.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 441392 + ... + 488138.

It is an arithmetic number, because the mean of its divisors is an integer number (953659200).

Almost surely, 2^21726369455 is an apocalyptic number.

21726369455 is a deficient number, since it is larger than the sum of its proper divisors (8790724945).

21726369455 is an equidigital number, since it uses as much as digits as its factorization.

21726369455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47044 (or 47030 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 50.

The spelling of 21726369455 in words is "twenty-one billion, seven hundred twenty-six million, three hundred sixty-nine thousand, four hundred fifty-five".