21300111233 has 4 divisors (see below), whose sum is σ = 21300408660. Its totient is φ = 21299813808.

The previous prime is 21300111229. The next prime is 21300111241. The reversal of 21300111233 is 33211100312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 14577423169 + 6722688064 = 120737^2 + 81992^2 .

It is a cyclic number.

It is not a de Polignac number, because 21300111233 - 2² = 21300111229 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21300111263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31523 + ... + 208791.

It is an arithmetic number, because the mean of its divisors is an integer number (5325102165).

Almost surely, 2^21300111233 is an apocalyptic number.

It is an amenable number.

21300111233 is a deficient number, since it is larger than the sum of its proper divisors (297427).

21300111233 is a wasteful number, since it uses less digits than its factorization.

21300111233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297426.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21300111233 its reverse (33211100312), we get a palindrome (54511211545).

The spelling of 21300111233 in words is "twenty-one billion, three hundred million, one hundred eleven thousand, two hundred thirty-three".