21110120233 has 2 divisors, whose sum is σ = 21110120234. Its totient is φ = 21110120232.

The previous prime is 21110120231. The next prime is 21110120281. The reversal of 21110120233 is 33202101112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17871144489 + 3238975744 = 133683^2 + 56912^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110120233 - 2¹ = 21110120231 is a prime.

Together with 21110120231, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21110120231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555060116 + 10555060117.

It is an arithmetic number, because the mean of its divisors is an integer number (10555060117).

Almost surely, 2^21110120233 is an apocalyptic number.

It is an amenable number.

21110120233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110120233 is an equidigital number, since it uses as much as digits as its factorization.

21110120233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21110120233 its reverse (33202101112), we get a palindrome (54312221345).

The spelling of 21110120233 in words is "twenty-one billion, one hundred ten million, one hundred twenty thousand, two hundred thirty-three".