21082271 has 16 divisors (see below), whose sum is σ = 24790080. Its totient is φ = 17556480.

The previous prime is 21082253. The next prime is 21082277. The reversal of 21082271 is 17228012.

It is a cyclic number.

It is not a de Polignac number, because 21082271 - 2⁶ = 21082207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21082277) 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, 41165 + ... + 41673.

It is an arithmetic number, because the mean of its divisors is an integer number (1549380).

Almost surely, 2^21082271 is an apocalyptic number.

21082271 is a deficient number, since it is larger than the sum of its proper divisors (3707809).

21082271 is an equidigital number, since it uses as much as digits as its factorization.

21082271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 21082271 is about 4591.5434224234. The cubic root of 21082271 is about 276.2522330102.

The spelling of 21082271 in words is "twenty-one million, eighty-two thousand, two hundred seventy-one".