21030234 has 16 divisors (see below), whose sum is σ = 43889472. Its totient is φ = 6705248.

The previous prime is 21030227. The next prime is 21030239. The reversal of 21030234 is 43203012.

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, 76059 + ... + 76334.

It is an arithmetic number, because the mean of its divisors is an integer number (2743092).

Almost surely, 2^21030234 is an apocalyptic number.

21030234 is an abundant number, since it is smaller than the sum of its proper divisors (22859238).

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

21030234 is a wasteful number, since it uses less digits than its factorization.

21030234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152421.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 21030234 is about 4585.8733083242. The cubic root of 21030234 is about 276.0247562335.

Adding to 21030234 its reverse (43203012), we get a palindrome (64233246).

The spelling of 21030234 in words is "twenty-one million, thirty thousand, two hundred thirty-four".