21011124133 has 2 divisors, whose sum is σ = 21011124134. Its totient is φ = 21011124132.

The previous prime is 21011124091. The next prime is 21011124203. The reversal of 21011124133 is 33142111012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15699338209 + 5311785924 = 125297^2 + 72882^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011124133 - 2⁹ = 21011123621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21011124133.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011124833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505562066 + 10505562067.

It is an arithmetic number, because the mean of its divisors is an integer number (10505562067).

Almost surely, 2^21011124133 is an apocalyptic number.

It is an amenable number.

21011124133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011124133 is an equidigital number, since it uses as much as digits as its factorization.

21011124133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21011124133 its reverse (33142111012), we get a palindrome (54153235145).

The spelling of 21011124133 in words is "twenty-one billion, eleven million, one hundred twenty-four thousand, one hundred thirty-three".