21528196 has 6 divisors (see below), whose sum is σ = 37674350. Its totient is φ = 10764096.

The previous prime is 21528193. The next prime is 21528217. The reversal of 21528196 is 69182512.

It can be written as a sum of positive squares in only one way, i.e., 16402500 + 5125696 = 4050^2 + 2264^2 .

It is not an unprimeable number, because it can be changed into a prime (21528193) 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 as a sum of consecutive naturals, namely, 2691021 + ... + 2691028.

Almost surely, 2^21528196 is an apocalyptic number.

It is an amenable number.

21528196 is a deficient number, since it is larger than the sum of its proper divisors (16146154).

21528196 is a wasteful number, since it uses less digits than its factorization.

21528196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5382053 (or 5382051 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

The square root of 21528196 is about 4639.8487044299. The cubic root of 21528196 is about 278.1863905387.

The spelling of 21528196 in words is "twenty-one million, five hundred twenty-eight thousand, one hundred ninety-six".