21414872 has 16 divisors (see below), whose sum is σ = 40205400. Its totient is φ = 10693440.

The previous prime is 21414871. The next prime is 21414923. The reversal of 21414872 is 27841412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21414871) 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, 7847 + ... + 10217.

Almost surely, 2^21414872 is an apocalyptic number.

It is an amenable number.

21414872 is a deficient number, since it is larger than the sum of its proper divisors (18790528).

21414872 is a wasteful number, since it uses less digits than its factorization.

21414872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3506 (or 3502 counting only the distinct ones).

The product of its digits is 3584, while the sum is 29.

The square root of 21414872 is about 4627.6205548856. The cubic root of 21414872 is about 277.6974089745.

The spelling of 21414872 in words is "twenty-one million, four hundred fourteen thousand, eight hundred seventy-two".