21424814 has 8 divisors (see below), whose sum is σ = 32162808. Its totient is φ = 10703880.

The previous prime is 21424787. The next prime is 21424829. The reversal of 21424814 is 41842412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437 + ... + 6560.

It is an arithmetic number, because the mean of its divisors is an integer number (4020351).

Almost surely, 2^21424814 is an apocalyptic number.

21424814 is a deficient number, since it is larger than the sum of its proper divisors (10737994).

21424814 is a wasteful number, since it uses less digits than its factorization.

21424814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8530.

The product of its digits is 2048, while the sum is 26.

The square root of 21424814 is about 4628.6946323991. The cubic root of 21424814 is about 277.7403766296.

The spelling of 21424814 in words is "twenty-one million, four hundred twenty-four thousand, eight hundred fourteen".