21002133 has 8 divisors (see below), whose sum is σ = 28033696. Its totient is φ = 13986000.

The previous prime is 21002129. The next prime is 21002203. The reversal of 21002133 is 33120012.

It is a happy number.

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

It is not a de Polignac number, because 21002133 - 2² = 21002129 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 (21072133) 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, 178 + ... + 6483.

It is an arithmetic number, because the mean of its divisors is an integer number (3504212).

Almost surely, 2^21002133 is an apocalyptic number.

It is an amenable number.

21002133 is a deficient number, since it is larger than the sum of its proper divisors (7031563).

21002133 is a wasteful number, since it uses less digits than its factorization.

21002133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7715.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 21002133 is about 4582.8084184264. The cubic root of 21002133 is about 275.9017582509.

Adding to 21002133 its reverse (33120012), we get a palindrome (54122145).

The spelling of 21002133 in words is "twenty-one million, two thousand, one hundred thirty-three".