21700328 has 16 divisors (see below), whose sum is σ = 43818180. Its totient is φ = 10015488.

The previous prime is 21700321. The next prime is 21700333. The reversal of 21700328 is 82300712.

It can be written as a sum of positive squares in 2 ways, for example, as 21696964 + 3364 = 4658^2 + 58^2 .

It is not an unprimeable number, because it can be changed into a prime (21700321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104225 + ... + 104432.

Almost surely, 2^21700328 is an apocalyptic number.

It is an amenable number.

21700328 is an abundant number, since it is smaller than the sum of its proper divisors (22117852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21700328 is a wasteful number, since it uses less digits than its factorization.

21700328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208676 (or 208672 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 21700328 is about 4658.3610851887. The cubic root of 21700328 is about 278.9258505520.

The spelling of 21700328 in words is "twenty-one million, seven hundred thousand, three hundred twenty-eight".