21110100133 has 2 divisors, whose sum is σ = 21110100134. Its totient is φ = 21110100132.

The previous prime is 21110100083. The next prime is 21110100161. The reversal of 21110100133 is 33100101112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20170248484 + 939851649 = 142022^2 + 30657^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110100133 - 2¹⁷ = 21109969061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110100433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555050066 + 10555050067.

It is an arithmetic number, because the mean of its divisors is an integer number (10555050067).

Almost surely, 2^21110100133 is an apocalyptic number.

It is an amenable number.

21110100133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110100133 is an equidigital number, since it uses as much as digits as its factorization.

21110100133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 21110100133 its reverse (33100101112), we get a palindrome (54210201245).

The spelling of 21110100133 in words is "twenty-one billion, one hundred ten million, one hundred thousand, one hundred thirty-three".