21626133271 has 4 divisors (see below), whose sum is σ = 21627897712. Its totient is φ = 21624368832.

The previous prime is 21626133251. The next prime is 21626133281. The reversal of 21626133271 is 17233162612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21626133271 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 (21626133251) 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, 863706 + ... + 888391.

It is an arithmetic number, because the mean of its divisors is an integer number (5406974428).

Almost surely, 2^21626133271 is an apocalyptic number.

21626133271 is a deficient number, since it is larger than the sum of its proper divisors (1764441).

21626133271 is a wasteful number, since it uses less digits than its factorization.

21626133271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1764440.

The product of its digits is 18144, while the sum is 34.

Adding to 21626133271 its reverse (17233162612), we get a palindrome (38859295883).

The spelling of 21626133271 in words is "twenty-one billion, six hundred twenty-six million, one hundred thirty-three thousand, two hundred seventy-one".