21341271 has 16 divisors (see below), whose sum is σ = 32609024. Its totient is φ = 12161664.

The previous prime is 21341249. The next prime is 21341317. The reversal of 21341271 is 17214312.

It is not a de Polignac number, because 21341271 - 2¹⁰ = 21340247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21361271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7920 + ... + 10266.

It is an arithmetic number, because the mean of its divisors is an integer number (2038064).

Almost surely, 2^21341271 is an apocalyptic number.

21341271 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21341271 is a deficient number, since it is larger than the sum of its proper divisors (11267753).

21341271 is a wasteful number, since it uses less digits than its factorization.

21341271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2790.

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

The square root of 21341271 is about 4619.6613512248. The cubic root of 21341271 is about 277.3789034166.

Adding to 21341271 its reverse (17214312), we get a palindrome (38555583).

It can be divided in two parts, 21341 and 271, that added together give a palindrome (21612).

The spelling of 21341271 in words is "twenty-one million, three hundred forty-one thousand, two hundred seventy-one".