21755116 has 6 divisors (see below), whose sum is σ = 38071460. Its totient is φ = 10877556.

The previous prime is 21755113. The next prime is 21755137. The reversal of 21755116 is 61155712.

It is not an unprimeable number, because it can be changed into a prime (21755113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2719386 + ... + 2719393.

Almost surely, 2^21755116 is an apocalyptic number.

It is an amenable number.

21755116 is a deficient number, since it is larger than the sum of its proper divisors (16316344).

21755116 is a wasteful number, since it uses less digits than its factorization.

21755116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5438783 (or 5438781 counting only the distinct ones).

The product of its digits is 2100, while the sum is 28.

The square root of 21755116 is about 4664.2379870671. The cubic root of 21755116 is about 279.1603930374.

The spelling of 21755116 in words is "twenty-one million, seven hundred fifty-five thousand, one hundred sixteen".