21454872 has 32 divisors (see below), whose sum is σ = 54067200. Its totient is φ = 7094304.

The previous prime is 21454871. The next prime is 21454879. The reversal of 21454872 is 27845412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21454871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472 + ... + 6567.

It is an arithmetic number, because the mean of its divisors is an integer number (1689600).

Almost surely, 2^21454872 is an apocalyptic number.

It is an amenable number.

21454872 is an abundant number, since it is smaller than the sum of its proper divisors (32612328).

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

21454872 is a wasteful number, since it uses less digits than its factorization.

21454872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7175 (or 7171 counting only the distinct ones).

The product of its digits is 17920, while the sum is 33.

The square root of 21454872 is about 4631.9404141245. The cubic root of 21454872 is about 277.8702014701.

The spelling of 21454872 in words is "twenty-one million, four hundred fifty-four thousand, eight hundred seventy-two".