21312122333303 has 4 divisors (see below), whose sum is σ = 21630213711480. Its totient is φ = 20994030955128.

The previous prime is 21312122333287. The next prime is 21312122333371. The reversal of 21312122333303 is 30333322121312.

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 21312122333303 - 2⁴ = 21312122333287 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 (21312122633303) 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, 159045688988 + ... + 159045689121.

It is an arithmetic number, because the mean of its divisors is an integer number (5407553427870).

Almost surely, 2^{21312122333303} is an apocalyptic number.

21312122333303 is a deficient number, since it is larger than the sum of its proper divisors (318091378177).

21312122333303 is an equidigital number, since it uses as much as digits as its factorization.

21312122333303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318091378176.

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

Adding to 21312122333303 its reverse (30333322121312), we get a palindrome (51645444454615).

The spelling of 21312122333303 in words is "twenty-one trillion, three hundred twelve billion, one hundred twenty-two million, three hundred thirty-three thousand, three hundred three".