21424214 has 16 divisors (see below), whose sum is σ = 37994400. Its totient is φ = 8865024.

The previous prime is 21424213. The next prime is 21424217. The reversal of 21424214 is 41242412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424213) 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, 25979 + ... + 26790.

It is an arithmetic number, because the mean of its divisors is an integer number (2374650).

Almost surely, 2^21424214 is an apocalyptic number.

21424214 is a deficient number, since it is larger than the sum of its proper divisors (16570186).

21424214 is a wasteful number, since it uses less digits than its factorization.

21424214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52807.

The product of its digits is 512, while the sum is 20.

The square root of 21424214 is about 4628.6298188557. The cubic root of 21424214 is about 277.7377839072.

Adding to 21424214 its reverse (41242412), we get a palindrome (62666626).

The spelling of 21424214 in words is "twenty-one million, four hundred twenty-four thousand, two hundred fourteen".