21112313333233 has 4 divisors (see below), whose sum is σ = 21121819104628. Its totient is φ = 21102807561840.

The previous prime is 21112313333191. The next prime is 21112313333261. The reversal of 21112313333233 is 33233331321112.

It is a happy number.

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 14595280422129 + 6517032911104 = 3820377^2 + 2552848^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112313333233 - 2⁴¹ = 18913290077681 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21112313333195 and 21112313333204.

It is not an unprimeable number, because it can be changed into a prime (21112313333273) 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, 4752882366 + ... + 4752886807.

It is an arithmetic number, because the mean of its divisors is an integer number (5280454776157).

Almost surely, 2^{21112313333233} is an apocalyptic number.

It is an amenable number.

21112313333233 is a deficient number, since it is larger than the sum of its proper divisors (9505771395).

21112313333233 is an equidigital number, since it uses as much as digits as its factorization.

21112313333233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9505771394.

The product of its digits is 17496, while the sum is 31.

Adding to 21112313333233 its reverse (33233331321112), we get a palindrome (54345644654345).

The spelling of 21112313333233 in words is "twenty-one trillion, one hundred twelve billion, three hundred thirteen million, three hundred thirty-three thousand, two hundred thirty-three".