21301111133 has 2 divisors, whose sum is σ = 21301111134. Its totient is φ = 21301111132.

The previous prime is 21301111081. The next prime is 21301111151. The reversal of 21301111133 is 33111110312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15247804324 + 6053306809 = 123482^2 + 77803^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21301111133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21301110133) 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 as a sum of consecutive naturals, namely, 10650555566 + 10650555567.

It is an arithmetic number, because the mean of its divisors is an integer number (10650555567).

Almost surely, 2^21301111133 is an apocalyptic number.

It is an amenable number.

21301111133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301111133 is an equidigital number, since it uses as much as digits as its factorization.

21301111133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 21301111133 its reverse (33111110312), we get a palindrome (54412221445).

The spelling of 21301111133 in words is "twenty-one billion, three hundred one million, one hundred eleven thousand, one hundred thirty-three".