21455214 has 16 divisors (see below), whose sum is σ = 46811520. Its totient is φ = 6501560.

The previous prime is 21455183. The next prime is 21455257. The reversal of 21455214 is 41255412.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162474 + ... + 162605.

It is an arithmetic number, because the mean of its divisors is an integer number (2925720).

Almost surely, 2^21455214 is an apocalyptic number.

21455214 is an abundant number, since it is smaller than the sum of its proper divisors (25356306).

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

21455214 is a wasteful number, since it uses less digits than its factorization.

21455214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325095.

The product of its digits is 1600, while the sum is 24.

The square root of 21455214 is about 4631.9773315507. The cubic root of 21455214 is about 277.8716779196.

The spelling of 21455214 in words is "twenty-one million, four hundred fifty-five thousand, two hundred fourteen".