21700304 has 10 divisors (see below), whose sum is σ = 42044370. Its totient is φ = 10850144.

The previous prime is 21700303. The next prime is 21700319. The reversal of 21700304 is 40300712.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17205904 + 4494400 = 4148^2 + 2120^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21700303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678119 + ... + 678150.

It is an arithmetic number, because the mean of its divisors is an integer number (4204437).

Almost surely, 2^21700304 is an apocalyptic number.

It is an amenable number.

21700304 is a deficient number, since it is larger than the sum of its proper divisors (20344066).

21700304 is a wasteful number, since it uses less digits than its factorization.

21700304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356277 (or 1356271 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 21700304 is about 4658.3585091747. The cubic root of 21700304 is about 278.9257477237.

The spelling of 21700304 in words is "twenty-one million, seven hundred thousand, three hundred four".