21226691171 has 20 divisors (see below), whose sum is σ = 25230377232. Its totient is φ = 17850910896.

The previous prime is 21226691089. The next prime is 21226691177. The reversal of 21226691171 is 17119662212.

It is a de Polignac number, because none of the positive numbers 2^k-21226691171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21226691177) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 43850 + ... + 210656.

Almost surely, 2^21226691171 is an apocalyptic number.

21226691171 is a deficient number, since it is larger than the sum of its proper divisors (4003686061).

21226691171 is an frugal number, since it uses more digits than its factorization.

21226691171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166888 (or 166867 counting only the distinct ones).

The product of its digits is 18144, while the sum is 38.

The spelling of 21226691171 in words is "twenty-one billion, two hundred twenty-six million, six hundred ninety-one thousand, one hundred seventy-one".