21199204 has 24 divisors (see below), whose sum is σ = 42304248. Its totient is φ = 9208320.

The previous prime is 21199201. The next prime is 21199207. The reversal of 21199204 is 40299112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21199201) and next prime (21199207).

It can be written as a sum of positive squares in 4 ways, for example, as 39204 + 21160000 = 198^2 + 4600^2 .

It is not an unprimeable number, because it can be changed into a prime (21199201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11107 + ... + 12874.

It is an arithmetic number, because the mean of its divisors is an integer number (1762677).

Almost surely, 2^21199204 is an apocalyptic number.

It is an amenable number.

21199204 is a deficient number, since it is larger than the sum of its proper divisors (21105044).

21199204 is a wasteful number, since it uses less digits than its factorization.

21199204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24015 (or 24013 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 21199204 is about 4604.2593324008. The cubic root of 21199204 is about 276.7620367651.

The spelling of 21199204 in words is "twenty-one million, one hundred ninety-nine thousand, two hundred four".