21111300233 has 2 divisors, whose sum is σ = 21111300234. Its totient is φ = 21111300232.

The previous prime is 21111300193. The next prime is 21111300277. The reversal of 21111300233 is 33200311112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19295432464 + 1815867769 = 138908^2 + 42613^2 .

It is a cyclic number.

It is not a de Polignac number, because 21111300233 - 2²⁴ = 21094523017 is a prime.

It is not a weakly prime, because it can be changed into another prime (21111300533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555650116 + 10555650117.

It is an arithmetic number, because the mean of its divisors is an integer number (10555650117).

Almost surely, 2^21111300233 is an apocalyptic number.

It is an amenable number.

21111300233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111300233 is an equidigital number, since it uses as much as digits as its factorization.

21111300233 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21111300233 its reverse (33200311112), we get a palindrome (54311611345).

The spelling of 21111300233 in words is "twenty-one billion, one hundred eleven million, three hundred thousand, two hundred thirty-three".