21942716 has 24 divisors (see below), whose sum is σ = 40946976. Its totient is φ = 10252800.

The previous prime is 21942707. The next prime is 21942719. The reversal of 21942716 is 61724912.

It is a happy number.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

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, 9200 + ... + 11336.

It is an arithmetic number, because the mean of its divisors is an integer number (1706124).

Almost surely, 2^21942716 is an apocalyptic number.

It is an amenable number.

21942716 is a deficient number, since it is larger than the sum of its proper divisors (19004260).

21942716 is a wasteful number, since it uses less digits than its factorization.

21942716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2309 (or 2307 counting only the distinct ones).

The product of its digits is 6048, while the sum is 32.

The square root of 21942716 is about 4684.3052846714. The cubic root of 21942716 is about 279.9605216449.

The spelling of 21942716 in words is "twenty-one million, nine hundred forty-two thousand, seven hundred sixteen".