21254288 has 20 divisors (see below), whose sum is σ = 44924208. Its totient is φ = 9660960.

The previous prime is 21254279. The next prime is 21254297. The reversal of 21254288 is 88245212.

It is an interprime number because it is at equal distance from previous prime (21254279) and next prime (21254297).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60206 + ... + 60557.

Almost surely, 2^21254288 is an apocalyptic number.

It is an amenable number.

21254288 is an abundant number, since it is smaller than the sum of its proper divisors (23669920).

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

21254288 is a wasteful number, since it uses less digits than its factorization.

21254288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120782 (or 120776 counting only the distinct ones).

The product of its digits is 10240, while the sum is 32.

The square root of 21254288 is about 4610.2373040875. The cubic root of 21254288 is about 277.0015422158.

The spelling of 21254288 in words is "twenty-one million, two hundred fifty-four thousand, two hundred eighty-eight".