21030230 has 16 divisors (see below), whose sum is σ = 40766544. Its totient is φ = 7764960.

The previous prime is 21030227. The next prime is 21030239. The reversal of 21030230 is 3203012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80756 + ... + 81015.

It is an arithmetic number, because the mean of its divisors is an integer number (2547909).

Almost surely, 2^21030230 is an apocalyptic number.

21030230 is a deficient number, since it is larger than the sum of its proper divisors (19736314).

21030230 is a wasteful number, since it uses less digits than its factorization.

21030230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161791.

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

The square root of 21030230 is about 4585.8728722022. The cubic root of 21030230 is about 276.0247387333.

Adding to 21030230 its reverse (3203012), we get a palindrome (24233242).

The spelling of 21030230 in words is "twenty-one million, thirty thousand, two hundred thirty".