21254271 has 4 divisors (see below), whose sum is σ = 28339032. Its totient is φ = 14169512.

The previous prime is 21254269. The next prime is 21254273. The reversal of 21254271 is 17245212.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21254269) and next prime (21254273).

It is a cyclic number.

It is not a de Polignac number, because 21254271 - 2¹ = 21254269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21254273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3542376 + ... + 3542381.

It is an arithmetic number, because the mean of its divisors is an integer number (7084758).

Almost surely, 2^21254271 is an apocalyptic number.

21254271 is a deficient number, since it is larger than the sum of its proper divisors (7084761).

21254271 is an equidigital number, since it uses as much as digits as its factorization.

21254271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7084760.

The product of its digits is 1120, while the sum is 24.

The square root of 21254271 is about 4610.2354603643. The cubic root of 21254271 is about 277.0014683636.

Adding to 21254271 its reverse (17245212), we get a palindrome (38499483).

The spelling of 21254271 in words is "twenty-one million, two hundred fifty-four thousand, two hundred seventy-one".