21013334 has 16 divisors (see below), whose sum is σ = 32371488. Its totient is φ = 10226112.

The previous prime is 21013303. The next prime is 21013357. The reversal of 21013334 is 43331012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13799 + ... + 15245.

It is an arithmetic number, because the mean of its divisors is an integer number (2023218).

Almost surely, 2^21013334 is an apocalyptic number.

21013334 is a deficient number, since it is larger than the sum of its proper divisors (11358154).

21013334 is a wasteful number, since it uses less digits than its factorization.

21013334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 21013334 is about 4584.0303227618. The cubic root of 21013334 is about 275.9507981327.

Adding to 21013334 its reverse (43331012), we get a palindrome (64344346).

The spelling of 21013334 in words is "twenty-one million, thirteen thousand, three hundred thirty-four".