21331334 has 16 divisors (see below), whose sum is σ = 33145200. Its totient is φ = 10289760.

The previous prime is 21331333. The next prime is 21331339. The reversal of 21331334 is 43313312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331333) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 4817 + ... + 8115.

It is an arithmetic number, because the mean of its divisors is an integer number (2071575).

Almost surely, 2^21331334 is an apocalyptic number.

21331334 is a deficient number, since it is larger than the sum of its proper divisors (11813866).

21331334 is a wasteful number, since it uses less digits than its factorization.

21331334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3415.

The product of its digits is 648, while the sum is 20.

The square root of 21331334 is about 4618.5857142636. The cubic root of 21331334 is about 277.3358453427.

Adding to 21331334 its reverse (43313312), we get a palindrome (64644646).

The spelling of 21331334 in words is "twenty-one million, three hundred thirty-one thousand, three hundred thirty-four".