21942916 has 24 divisors (see below), whose sum is σ = 39836160. Its totient is φ = 10564800.

The previous prime is 21942911. The next prime is 21942919. The reversal of 21942916 is 61924912.

It is not an unprimeable number, because it can be changed into a prime (21942911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38280 + ... + 38848.

It is an arithmetic number, because the mean of its divisors is an integer number (1659840).

Almost surely, 2^21942916 is an apocalyptic number.

It is an amenable number.

21942916 is a deficient number, since it is larger than the sum of its proper divisors (17893244).

21942916 is a wasteful number, since it uses less digits than its factorization.

21942916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915 (or 913 counting only the distinct ones).

The product of its digits is 7776, while the sum is 34.

The square root of 21942916 is about 4684.3266325055. The cubic root of 21942916 is about 279.9613722223.

The spelling of 21942916 in words is "twenty-one million, nine hundred forty-two thousand, nine hundred sixteen".