21271822252 has 6 divisors (see below), whose sum is σ = 37225688948. Its totient is φ = 10635911124.

The previous prime is 21271822241. The next prime is 21271822279. The reversal of 21271822252 is 25222817212.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2658977778 + ... + 2658977785.

Almost surely, 2^21271822252 is an apocalyptic number.

It is an amenable number.

21271822252 is a deficient number, since it is larger than the sum of its proper divisors (15953866696).

21271822252 is a wasteful number, since it uses less digits than its factorization.

21271822252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5317955567 (or 5317955565 counting only the distinct ones).

The product of its digits is 17920, while the sum is 34.

The spelling of 21271822252 in words is "twenty-one billion, two hundred seventy-one million, eight hundred twenty-two thousand, two hundred fifty-two".