21235234 has 8 divisors (see below), whose sum is σ = 31911120. Its totient is φ = 10598196.

The previous prime is 21235223. The next prime is 21235243. The reversal of 21235234 is 43253212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8304 + ... + 10555.

It is an arithmetic number, because the mean of its divisors is an integer number (3988890).

Almost surely, 2^21235234 is an apocalyptic number.

21235234 is a deficient number, since it is larger than the sum of its proper divisors (10675886).

21235234 is a wasteful number, since it uses less digits than its factorization.

21235234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19424.

The product of its digits is 1440, while the sum is 22.

The square root of 21235234 is about 4608.1703527539. The cubic root of 21235234 is about 276.9187422121.

Adding to 21235234 its reverse (43253212), we get a palindrome (64488446).

The spelling of 21235234 in words is "twenty-one million, two hundred thirty-five thousand, two hundred thirty-four".