21120112133 has 2 divisors, whose sum is σ = 21120112134. Its totient is φ = 21120112132.

The previous prime is 21120112081. The next prime is 21120112147. The reversal of 21120112133 is 33121102112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18632796004 + 2487316129 = 136502^2 + 49873^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120112133 - 2⁸ = 21120111877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120112033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560056066 + 10560056067.

It is an arithmetic number, because the mean of its divisors is an integer number (10560056067).

Almost surely, 2^21120112133 is an apocalyptic number.

It is an amenable number.

21120112133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120112133 is an equidigital number, since it uses as much as digits as its factorization.

21120112133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21120112133 its reverse (33121102112), we get a palindrome (54241214245).

The spelling of 21120112133 in words is "twenty-one billion, one hundred twenty million, one hundred twelve thousand, one hundred thirty-three".