21021103302233 has 4 divisors (see below), whose sum is σ = 21022436045028. Its totient is φ = 21019770559440.

The previous prime is 21021103302229. The next prime is 21021103302253. The reversal of 21021103302233 is 33220330112012.

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 4615265932489 + 16405837369744 = 2148317^2 + 4050412^2 .

It is a cyclic number.

It is not a de Polignac number, because 21021103302233 - 2² = 21021103302229 is a prime.

It is a super-2 number, since 2×21021103302233² (a number of 27 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 = 21021103302199 and 21021103302208.

It is not an unprimeable number, because it can be changed into a prime (21021103302253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666347738 + ... + 666379283.

It is an arithmetic number, because the mean of its divisors is an integer number (5255609011257).

Almost surely, 2^{21021103302233} is an apocalyptic number.

It is an amenable number.

21021103302233 is a deficient number, since it is larger than the sum of its proper divisors (1332742795).

21021103302233 is a wasteful number, since it uses less digits than its factorization.

21021103302233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332742794.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21021103302233 its reverse (33220330112012), we get a palindrome (54241433414245).

The spelling of 21021103302233 in words is "twenty-one trillion, twenty-one billion, one hundred three million, three hundred two thousand, two hundred thirty-three".