21201320271 has 8 divisors (see below), whose sum is σ = 28269354544. Its totient is φ = 14133749760.

The previous prime is 21201320269. The next prime is 21201320281. The reversal of 21201320271 is 17202310212.

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

It is not a de Polignac number, because 21201320271 - 2¹ = 21201320269 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 (21201320201) 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, 10401 + ... + 206181.

It is an arithmetic number, because the mean of its divisors is an integer number (3533669318).

Almost surely, 2^21201320271 is an apocalyptic number.

21201320271 is a deficient number, since it is larger than the sum of its proper divisors (7068034273).

21201320271 is a wasteful number, since it uses less digits than its factorization.

21201320271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231881.

The product of its (nonzero) digits is 336, while the sum is 21.

Adding to 21201320271 its reverse (17202310212), we get a palindrome (38403630483).

The spelling of 21201320271 in words is "twenty-one billion, two hundred one million, three hundred twenty thousand, two hundred seventy-one".