21254044 has 18 divisors (see below), whose sum is σ = 43267560. Its totient is φ = 9108792.

The previous prime is 21254041. The next prime is 21254069. The reversal of 21254044 is 44045212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21254041) 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, 54024 + ... + 54415.

Almost surely, 2^21254044 is an apocalyptic number.

It is an amenable number.

21254044 is an abundant number, since it is smaller than the sum of its proper divisors (22013516).

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

21254044 is a wasteful number, since it uses less digits than its factorization.

21254044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108457 (or 108448 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 21254044 is about 4610.2108411655. The cubic root of 21254044 is about 277.0004822158. Note that the first 3 decimals are identical.

Adding to 21254044 its reverse (44045212), we get a palindrome (65299256).

The spelling of 21254044 in words is "twenty-one million, two hundred fifty-four thousand, forty-four".