21213233321303 has 4 divisors (see below), whose sum is σ = 21214141562040. Its totient is φ = 21212325080568.

The previous prime is 21213233321237. The next prime is 21213233321321. The reversal of 21213233321303 is 30312333231212.

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

It is a cyclic number.

It is not a de Polignac number, because 21213233321303 - 2⁸ = 21213233321047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213233321393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454085333 + ... + 454132046.

It is an arithmetic number, because the mean of its divisors is an integer number (5303535390510).

Almost surely, 2^{21213233321303} is an apocalyptic number.

21213233321303 is a deficient number, since it is larger than the sum of its proper divisors (908240737).

21213233321303 is an equidigital number, since it uses as much as digits as its factorization.

21213233321303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908240736.

The product of its (nonzero) digits is 11664, while the sum is 29.

Adding to 21213233321303 its reverse (30312333231212), we get a palindrome (51525566552515).

Subtracting 21213233321303 from its reverse (30312333231212), we obtain a palindrome (9099099909909).

The spelling of 21213233321303 in words is "twenty-one trillion, two hundred thirteen billion, two hundred thirty-three million, three hundred twenty-one thousand, three hundred three".