21839275 has 6 divisors (see below), whose sum is σ = 27080732. Its totient is φ = 17471400.

The previous prime is 21839273. The next prime is 21839297. The reversal of 21839275 is 57293812.

It is not a de Polignac number, because 21839275 - 2¹ = 21839273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21839273) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 436761 + ... + 436810.

Almost surely, 2^21839275 is an apocalyptic number.

21839275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21839275 is a deficient number, since it is larger than the sum of its proper divisors (5241457).

21839275 is an equidigital number, since it uses as much as digits as its factorization.

21839275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873581 (or 873576 counting only the distinct ones).

The product of its digits is 30240, while the sum is 37.

The square root of 21839275 is about 4673.2510097362. The cubic root of 21839275 is about 279.5199043261.

It can be divided in two parts, 218 and 39275, that added together give a palindrome (39493).

The spelling of 21839275 in words is "twenty-one million, eight hundred thirty-nine thousand, two hundred seventy-five".