21003000233 has 4 divisors (see below), whose sum is σ = 21003519060. Its totient is φ = 21002481408.

The previous prime is 21003000209. The next prime is 21003000289. The reversal of 21003000233 is 33200030012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20435274304 + 567725929 = 142952^2 + 23827^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21003000233 is a prime.

It is a super-2 number, since 2×21003000233² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21003200233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193028 + ... + 281541.

It is an arithmetic number, because the mean of its divisors is an integer number (5250879765).

Almost surely, 2^21003000233 is an apocalyptic number.

It is an amenable number.

21003000233 is a deficient number, since it is larger than the sum of its proper divisors (518827).

21003000233 is an equidigital number, since it uses as much as digits as its factorization.

21003000233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518826.

The product of its (nonzero) digits is 108, while the sum is 14.

Adding to 21003000233 its reverse (33200030012), we get a palindrome (54203030245).

The spelling of 21003000233 in words is "twenty-one billion, three million, two hundred thirty-three", and thus it is an aban number.