21003230 has 16 divisors (see below), whose sum is σ = 38096784. Its totient is φ = 8336640.

The previous prime is 21003223. The next prime is 21003247. The reversal of 21003230 is 3230012.

It is a super-2 number, since 2×21003230² = 882271340865800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6707 + ... + 9326.

It is an arithmetic number, because the mean of its divisors is an integer number (2381049).

Almost surely, 2^21003230 is an apocalyptic number.

21003230 is a deficient number, since it is larger than the sum of its proper divisors (17093554).

21003230 is a wasteful number, since it uses less digits than its factorization.

21003230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16171.

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 21003230 is about 4582.9281032982. The cubic root of 21003230 is about 275.9065618734.

Adding to 21003230 its reverse (3230012), we get a palindrome (24233242).

The spelling of 21003230 in words is "twenty-one million, three thousand, two hundred thirty".