21942718 has 16 divisors (see below), whose sum is σ = 37684224. Its totient is φ = 9387000.

The previous prime is 21942707. The next prime is 21942719. The reversal of 21942718 is 81724912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21942719) 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, 9471 + ... + 11557.

It is an arithmetic number, because the mean of its divisors is an integer number (2355264).

Almost surely, 2^21942718 is an apocalyptic number.

21942718 is a deficient number, since it is larger than the sum of its proper divisors (15741506).

21942718 is a wasteful number, since it uses less digits than its factorization.

21942718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2847.

The product of its digits is 8064, while the sum is 34.

The square root of 21942718 is about 4684.3054981502. The cubic root of 21942718 is about 279.9605301507.

The spelling of 21942718 in words is "twenty-one million, nine hundred forty-two thousand, seven hundred eighteen".