21487214 has 16 divisors (see below), whose sum is σ = 38774400. Its totient is φ = 8724024.

The previous prime is 21487183. The next prime is 21487243. The reversal of 21487214 is 41278412.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40124 + ... + 40655.

It is an arithmetic number, because the mean of its divisors is an integer number (2423400).

Almost surely, 2^21487214 is an apocalyptic number.

21487214 is a deficient number, since it is larger than the sum of its proper divisors (17287186).

21487214 is a wasteful number, since it uses less digits than its factorization.

21487214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80807.

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

The square root of 21487214 is about 4635.4302928639. The cubic root of 21487214 is about 278.0097558814.

The spelling of 21487214 in words is "twenty-one million, four hundred eighty-seven thousand, two hundred fourteen".