21450814 has 16 divisors (see below), whose sum is σ = 40116096. Its totient is φ = 8357400.

The previous prime is 21450811. The next prime is 21450827. The reversal of 21450814 is 41805412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450811) 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, 69492 + ... + 69799.

It is an arithmetic number, because the mean of its divisors is an integer number (2507256).

Almost surely, 2^21450814 is an apocalyptic number.

21450814 is a deficient number, since it is larger than the sum of its proper divisors (18665282).

21450814 is a wasteful number, since it uses less digits than its factorization.

21450814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139311.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 21450814 is about 4631.5023480508. The cubic root of 21450814 is about 277.8526814653.

The spelling of 21450814 in words is "twenty-one million, four hundred fifty thousand, eight hundred fourteen".