21456214 has 32 divisors (see below), whose sum is σ = 35814240. Its totient is φ = 9580032.

The previous prime is 21456203. The next prime is 21456221. The reversal of 21456214 is 41265412.

It is a happy number.

It is a super-3 number, since 3×21456214³ (a number of 23 digits) contains 333 as substring.

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 15 ways as a sum of consecutive naturals, for example, 189822 + ... + 189934.

It is an arithmetic number, because the mean of its divisors is an integer number (1119195).

Almost surely, 2^21456214 is an apocalyptic number.

21456214 is a deficient number, since it is larger than the sum of its proper divisors (14358026).

21456214 is a wasteful number, since it uses less digits than its factorization.

21456214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304.

The product of its digits is 1920, while the sum is 25.

The square root of 21456214 is about 4632.0852755535. The cubic root of 21456214 is about 277.8759949333.

The spelling of 21456214 in words is "twenty-one million, four hundred fifty-six thousand, two hundred fourteen".