21170944 has 18 divisors (see below), whose sum is σ = 42259700. Its totient is φ = 10585344.

The previous prime is 21170917. The next prime is 21170969. The reversal of 21170944 is 44907112.

It is a super-2 number, since 2×21170944² = 896417739702272, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41094 + ... + 41605.

Almost surely, 2^21170944 is an apocalyptic number.

It is an amenable number.

21170944 is a deficient number, since it is larger than the sum of its proper divisors (21088756).

21170944 is an frugal number, since it uses more digits than its factorization.

21170944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82715 (or 82701 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 21170944 is about 4601.1894114457. The cubic root of 21170944 is about 276.6390011207.

The spelling of 21170944 in words is "twenty-one million, one hundred seventy thousand, nine hundred forty-four".