21214374 has 32 divisors (see below), whose sum is σ = 45308160. Its totient is φ = 6602400.

The previous prime is 21214373. The next prime is 21214381. The reversal of 21214374 is 47341212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6784 + ... + 9404.

It is an arithmetic number, because the mean of its divisors is an integer number (1415880).

Almost surely, 2^21214374 is an apocalyptic number.

21214374 is an abundant number, since it is smaller than the sum of its proper divisors (24093786).

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

21214374 is a wasteful number, since it uses less digits than its factorization.

21214374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2716.

The product of its digits is 1344, while the sum is 24.

The square root of 21214374 is about 4605.9064254498. The cubic root of 21214374 is about 276.8280373412.

Adding to 21214374 its reverse (47341212), we get a palindrome (68555586).

The spelling of 21214374 in words is "twenty-one million, two hundred fourteen thousand, three hundred seventy-four".