21804230 has 64 divisors (see below), whose sum is σ = 48522240. Its totient is φ = 6889344.

The previous prime is 21804227. The next prime is 21804239. The reversal of 21804230 is 3240812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21804239) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46457 + ... + 46923.

It is an arithmetic number, because the mean of its divisors is an integer number (758160).

Almost surely, 2^21804230 is an apocalyptic number.

It is a pronic number, being equal to 4669×4670.

21804230 is an abundant number, since it is smaller than the sum of its proper divisors (26718010).

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

21804230 is a wasteful number, since it uses less digits than its factorization.

21804230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 21804230 is about 4669.4999732305. The cubic root of 21804230 is about 279.3703111519.

The spelling of 21804230 in words is "twenty-one million, eight hundred four thousand, two hundred thirty".