21684202 has 8 divisors (see below), whose sum is σ = 33218496. Its totient is φ = 10611372.

The previous prime is 21684191. The next prime is 21684209. The reversal of 21684202 is 20248612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21684209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115248 + ... + 115435.

It is an arithmetic number, because the mean of its divisors is an integer number (4152312).

Almost surely, 2^21684202 is an apocalyptic number.

21684202 is a deficient number, since it is larger than the sum of its proper divisors (11534294).

21684202 is a wasteful number, since it uses less digits than its factorization.

21684202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230732.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 21684202 is about 4656.6298972540. The cubic root of 21684202 is about 278.8567414138.

The spelling of 21684202 in words is "twenty-one million, six hundred eighty-four thousand, two hundred two".