21254275 has 12 divisors (see below), whose sum is σ = 30120592. Its totient is φ = 14574240.

The previous prime is 21254273. The next prime is 21254279. The reversal of 21254275 is 57245212.

It is not a de Polignac number, because 21254275 - 2¹ = 21254273 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian 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 11 ways as a sum of consecutive naturals, for example, 60552 + ... + 60901.

Almost surely, 2^21254275 is an apocalyptic number.

21254275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21254275 is a deficient number, since it is larger than the sum of its proper divisors (8866317).

21254275 is a wasteful number, since it uses less digits than its factorization.

21254275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121470 (or 121465 counting only the distinct ones).

The product of its digits is 5600, while the sum is 28.

The square root of 21254275 is about 4610.2358941816. The cubic root of 21254275 is about 277.0014857406.

Adding to 21254275 its reverse (57245212), we get a palindrome (78499487).

It can be divided in two parts, 2125 and 4275, that added together give a square (6400 = 80²).

The spelling of 21254275 in words is "twenty-one million, two hundred fifty-four thousand, two hundred seventy-five".