21013333 has 8 divisors (see below), whose sum is σ = 22957920. Its totient is φ = 19074480.

The previous prime is 21013303. The next prime is 21013357. The reversal of 21013333 is 33331012.

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

It is a cyclic number.

It is not a de Polignac number, because 21013333 - 2⁵ = 21013301 is a prime.

It is a Duffinian number.

21013333 is a modest number, since divided by 3333 gives 2101 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10866 + ... + 12652.

It is an arithmetic number, because the mean of its divisors is an integer number (2869740).

Almost surely, 2^21013333 is an apocalyptic number.

It is an amenable number.

21013333 is a deficient number, since it is larger than the sum of its proper divisors (1944587).

21013333 is a wasteful number, since it uses less digits than its factorization.

21013333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2867.

The product of its (nonzero) digits is 162, while the sum is 16.

The square root of 21013333 is about 4584.0302136875. The cubic root of 21013333 is about 275.9507937553.

Adding to 21013333 its reverse (33331012), we get a palindrome (54344345).

The spelling of 21013333 in words is "twenty-one million, thirteen thousand, three hundred thirty-three".