21230234 has 4 divisors (see below), whose sum is σ = 31845354. Its totient is φ = 10615116.

The previous prime is 21230227. The next prime is 21230243. The reversal of 21230234 is 43203212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20675209 + 555025 = 4547^2 + 745^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5307557 + ... + 5307560.

Almost surely, 2^21230234 is an apocalyptic number.

21230234 is a deficient number, since it is larger than the sum of its proper divisors (10615120).

21230234 is a wasteful number, since it uses less digits than its factorization.

21230234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10615119.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 21230234 is about 4607.6278061493. The cubic root of 21230234 is about 276.8970062866.

Adding to 21230234 its reverse (43203212), we get a palindrome (64433446).

The spelling of 21230234 in words is "twenty-one million, two hundred thirty thousand, two hundred thirty-four".