21198976 has 16 divisors (see below), whose sum is σ = 42232590. Its totient is φ = 10599424.

The previous prime is 21198953. The next prime is 21198977. The reversal of 21198976 is 67989112.

It can be written as a sum of positive squares in only one way, i.e., 13133376 + 8065600 = 3624^2 + 2840^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21198977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82681 + ... + 82936.

Almost surely, 2^21198976 is an apocalyptic number.

It is an amenable number.

21198976 is a deficient number, since it is larger than the sum of its proper divisors (21033614).

21198976 is an equidigital number, since it uses as much as digits as its factorization.

21198976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165631 (or 165619 counting only the distinct ones).

The product of its digits is 54432, while the sum is 43.

The square root of 21198976 is about 4604.2345726516. The cubic root of 21198976 is about 276.7610445585.

The spelling of 21198976 in words is "twenty-one million, one hundred ninety-eight thousand, nine hundred seventy-six".