21003121333 has 8 divisors (see below), whose sum is σ = 21692252160.
Its totient is φ = 20314716240.
The previous prime is 21003121289. The next prime is 21003121357. The reversal of 21003121333 is 33312130012.
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 21003121333 - 221 = 21001024181 is a prime.
It is a super-2 number, since 2×210031213332 (a number of 21 digits) contains 22 as substring.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 21003121333.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21003127333) 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, 122293 + ... + 238666.
It is an arithmetic number, because the mean of its divisors is an integer number (2711531520).
Almost surely, 221003121333 is an apocalyptic number.
It is an amenable number.
21003121333 is a deficient number, since it is larger than the sum of its proper divisors (689130827).
21003121333 is a wasteful number, since it uses less digits than its factorization.
21003121333 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 362867.
The product of its (nonzero) digits is 324, while the sum is 19.
Adding to 21003121333 its reverse (33312130012), we get a palindrome (54315251345).
The spelling of 21003121333 in words is "twenty-one billion, three million, one hundred twenty-one thousand, three hundred thirty-three".