21110321233 has 2 divisors, whose sum is σ = 21110321234. Its totient is φ = 21110321232.

The previous prime is 21110321213. The next prime is 21110321249. The reversal of 21110321233 is 33212301112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15052345344 + 6057975889 = 122688^2 + 77833^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110321233 - 2⁵ = 21110321201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21110321233.

It is not a weakly prime, because it can be changed into another prime (21110321213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555160616 + 10555160617.

It is an arithmetic number, because the mean of its divisors is an integer number (10555160617).

Almost surely, 2^21110321233 is an apocalyptic number.

It is an amenable number.

21110321233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110321233 is an equidigital number, since it uses as much as digits as its factorization.

21110321233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21110321233 its reverse (33212301112), we get a palindrome (54322622345).

The spelling of 21110321233 in words is "twenty-one billion, one hundred ten million, three hundred twenty-one thousand, two hundred thirty-three".