21226275 has 36 divisors (see below), whose sum is σ = 43453072. Its totient is φ = 9702720.

The previous prime is 21226241. The next prime is 21226277. The reversal of 21226275 is 57262212.

It is not a de Polignac number, because 21226275 - 2⁷ = 21226147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21226277) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5164 + ... + 8313.

Almost surely, 2^21226275 is an apocalyptic number.

21226275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21226275 is an abundant number, since it is smaller than the sum of its proper divisors (22226797).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21226275 is a wasteful number, since it uses less digits than its factorization.

21226275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13500 (or 13492 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 21226275 is about 4607.1981724254. The cubic root of 21226275 is about 276.8797933597.

Adding to 21226275 its reverse (57262212), we get a palindrome (78488487).

The spelling of 21226275 in words is "twenty-one million, two hundred twenty-six thousand, two hundred seventy-five".