21333234 has 16 divisors (see below), whose sum is σ = 45948672. Its totient is φ = 6564048.

The previous prime is 21333199. The next prime is 21333251. The reversal of 21333234 is 43233312.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21333234.

It is an unprimeable number.

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, 136674 + ... + 136829.

It is an arithmetic number, because the mean of its divisors is an integer number (2871792).

Almost surely, 2^21333234 is an apocalyptic number.

21333234 is an abundant number, since it is smaller than the sum of its proper divisors (24615438).

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

21333234 is a wasteful number, since it uses less digits than its factorization.

21333234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273521.

The product of its digits is 1296, while the sum is 21.

The square root of 21333234 is about 4618.7914003557. The cubic root of 21333234 is about 277.3440792778.

Adding to 21333234 its reverse (43233312), we get a palindrome (64566546).

The spelling of 21333234 in words is "twenty-one million, three hundred thirty-three thousand, two hundred thirty-four".