21959116 has 12 divisors (see below), whose sum is σ = 39002488. Its totient is φ = 10815552.

The previous prime is 21959099. The next prime is 21959123. The reversal of 21959116 is 61195912.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40701 + ... + 41236.

Almost surely, 2^21959116 is an apocalyptic number.

It is an amenable number.

21959116 is a deficient number, since it is larger than the sum of its proper divisors (17043372).

21959116 is a wasteful number, since it uses less digits than its factorization.

21959116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82008 (or 82006 counting only the distinct ones).

The product of its digits is 4860, while the sum is 34.

The square root of 21959116 is about 4686.0554840932. The cubic root of 21959116 is about 280.0302518334.

It can be divided in two parts, 2195 and 9116, that added together give a palindrome (11311).

The spelling of 21959116 in words is "twenty-one million, nine hundred fifty-nine thousand, one hundred sixteen".