21111133033 has 2 divisors, whose sum is σ = 21111133034. Its totient is φ = 21111133032.

The previous prime is 21111132943. The next prime is 21111133051. The reversal of 21111133033 is 33033111112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20647678249 + 463454784 = 143693^2 + 21528^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111133033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21111133033.

It is not a weakly prime, because it can be changed into another prime (21111133633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555566516 + 10555566517.

It is an arithmetic number, because the mean of its divisors is an integer number (10555566517).

Almost surely, 2^21111133033 is an apocalyptic number.

It is an amenable number.

21111133033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111133033 is an equidigital number, since it uses as much as digits as its factorization.

21111133033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 21111133033 its reverse (33033111112), we get a palindrome (54144244145).

The spelling of 21111133033 in words is "twenty-one billion, one hundred eleven million, one hundred thirty-three thousand, thirty-three".