21726253633 has 16 divisors (see below), whose sum is σ = 25261061760. Its totient is φ = 18299465856.

The previous prime is 21726253631. The next prime is 21726253687. The reversal of 21726253633 is 33635262712.

It is not a de Polignac number, because 21726253633 - 2¹ = 21726253631 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21726253631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1170735 + ... + 1189147.

It is an arithmetic number, because the mean of its divisors is an integer number (1578816360).

Almost surely, 2^21726253633 is an apocalyptic number.

It is an amenable number.

21726253633 is a deficient number, since it is larger than the sum of its proper divisors (3534808127).

21726253633 is a wasteful number, since it uses less digits than its factorization.

21726253633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21336.

The product of its digits is 272160, while the sum is 40.

The spelling of 21726253633 in words is "twenty-one billion, seven hundred twenty-six million, two hundred fifty-three thousand, six hundred thirty-three".