21313334 has 16 divisors (see below), whose sum is σ = 37284000. Its totient is φ = 9133992.

The previous prime is 21313333. The next prime is 21313343. The reversal of 21313334 is 43331312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313333) 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, 14849 + ... + 16220.

It is an arithmetic number, because the mean of its divisors is an integer number (2330250).

Almost surely, 2^21313334 is an apocalyptic number.

21313334 is a deficient number, since it is larger than the sum of its proper divisors (15970666).

21313334 is an equidigital number, since it uses as much as digits as its factorization.

21313334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31092 (or 31078 counting only the distinct ones).

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

The square root of 21313334 is about 4616.6366545354. The cubic root of 21313334 is about 277.2578153732.

Adding to 21313334 its reverse (43331312), we get a palindrome (64644646).

The spelling of 21313334 in words is "twenty-one million, three hundred thirteen thousand, three hundred thirty-four".