21003011033 has 4 divisors (see below), whose sum is σ = 21003347508. Its totient is φ = 21002674560.

The previous prime is 21003010999. The next prime is 21003011111. The reversal of 21003011033 is 33011030012.

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 13814006089 + 7189004944 = 117533^2 + 84788^2 .

It is a cyclic number.

It is not a de Polignac number, because 21003011033 - 2⁶ = 21003010969 is a prime.

It is a super-2 number, since 2×21003011033² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21003010999 and 21003011017.

It is not an unprimeable number, because it can be changed into a prime (21003011933) 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, 44048 + ... + 209633.

It is an arithmetic number, because the mean of its divisors is an integer number (5250836877).

Almost surely, 2^21003011033 is an apocalyptic number.

It is an amenable number.

21003011033 is a deficient number, since it is larger than the sum of its proper divisors (336475).

21003011033 is an equidigital number, since it uses as much as digits as its factorization.

21003011033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336474.

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

Adding to 21003011033 its reverse (33011030012), we get a palindrome (54014041045).

The spelling of 21003011033 in words is "twenty-one billion, three million, eleven thousand, thirty-three".