21103212033 has 12 divisors (see below), whose sum is σ = 30501694080. Its totient is φ = 14059911096.

The previous prime is 21103212007. The next prime is 21103212041. The reversal of 21103212033 is 33021230112.

It is not a de Polignac number, because 21103212033 - 2¹⁰ = 21103211009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21103211997 and 21103212015.

It is not an unprimeable number, because it can be changed into a prime (21103212073) 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 11 ways as a sum of consecutive naturals, for example, 726373 + ... + 754866.

It is an arithmetic number, because the mean of its divisors is an integer number (2541807840).

Almost surely, 2^21103212033 is an apocalyptic number.

It is an amenable number.

21103212033 is a deficient number, since it is larger than the sum of its proper divisors (9398482047).

21103212033 is a wasteful number, since it uses less digits than its factorization.

21103212033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1482828 (or 1482825 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21103212033 its reverse (33021230112), we get a palindrome (54124442145).

The spelling of 21103212033 in words is "twenty-one billion, one hundred three million, two hundred twelve thousand, thirty-three".