21003313033 has 8 divisors (see below), whose sum is σ = 21572889408. Its totient is φ = 20433837744.

The previous prime is 21003312997. The next prime is 21003313043. The reversal of 21003313033 is 33031330012.

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 21003313033 - 2²¹ = 21001215881 is a prime.

It is a super-2 number, since 2×21003313033² (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 21003313033.

It is not an unprimeable number, because it can be changed into a prime (21003313043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 607860 + ... + 641482.

It is an arithmetic number, because the mean of its divisors is an integer number (2696611176).

Almost surely, 2^21003313033 is an apocalyptic number.

It is an amenable number.

21003313033 is a deficient number, since it is larger than the sum of its proper divisors (569576375).

21003313033 is a wasteful number, since it uses less digits than its factorization.

21003313033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50543.

The product of its (nonzero) digits is 486, while the sum is 19.

Adding to 21003313033 its reverse (33031330012), we get a palindrome (54034643045).

It can be divided in two parts, 2100 and 3313033, that added together give a palindrome (3315133).

The spelling of 21003313033 in words is "twenty-one billion, three million, three hundred thirteen thousand, thirty-three".