21271269817 has 8 divisors (see below), whose sum is σ = 24318489600. Its totient is φ = 18226166784.

The previous prime is 21271269793. The next prime is 21271269821. The reversal of 21271269817 is 71896217212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21271269817 - 2⁷ = 21271269689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21271269857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 507592 + ... + 547897.

It is an arithmetic number, because the mean of its divisors is an integer number (3039811200).

Almost surely, 2^21271269817 is an apocalyptic number.

It is an amenable number.

21271269817 is a deficient number, since it is larger than the sum of its proper divisors (3047219783).

21271269817 is a wasteful number, since it uses less digits than its factorization.

21271269817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058375.

The product of its digits is 169344, while the sum is 46.

The spelling of 21271269817 in words is "twenty-one billion, two hundred seventy-one million, two hundred sixty-nine thousand, eight hundred seventeen".