21013133 has 8 divisors (see below), whose sum is σ = 21904896. Its totient is φ = 20134800.

The previous prime is 21013127. The next prime is 21013159. The reversal of 21013133 is 33131012.

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 21013133 - 2⁴ = 21013117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013103) 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, 98 + ... + 6483.

It is an arithmetic number, because the mean of its divisors is an integer number (2738112).

Almost surely, 2^21013133 is an apocalyptic number.

It is an amenable number.

21013133 is a deficient number, since it is larger than the sum of its proper divisors (891763).

21013133 is a wasteful number, since it uses less digits than its factorization.

21013133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6715.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 21013133 is about 4584.0083987707. The cubic root of 21013133 is about 275.9499182741.

Adding to 21013133 its reverse (33131012), we get a palindrome (54144145).

The spelling of 21013133 in words is "twenty-one million, thirteen thousand, one hundred thirty-three".