21254412 has 12 divisors (see below), whose sum is σ = 49593656. Its totient is φ = 7084800.

The previous prime is 21254411. The next prime is 21254417. The reversal of 21254412 is 21445212.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21254411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 885589 + ... + 885612.

Almost surely, 2^21254412 is an apocalyptic number.

It is an amenable number.

21254412 is an abundant number, since it is smaller than the sum of its proper divisors (28339244).

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

21254412 is a wasteful number, since it uses less digits than its factorization.

21254412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771208 (or 1771206 counting only the distinct ones).

The product of its digits is 640, while the sum is 21.

The square root of 21254412 is about 4610.2507523995. The cubic root of 21254412 is about 277.0020809012.

Adding to 21254412 its reverse (21445212), we get a palindrome (42699624).

The spelling of 21254412 in words is "twenty-one million, two hundred fifty-four thousand, four hundred twelve".