21210112123133 has 2 divisors, whose sum is σ = 21210112123134. Its totient is φ = 21210112123132.

The previous prime is 21210112123069. The next prime is 21210112123171. The reversal of 21210112123133 is 33132121101212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20492977524889 + 717134598244 = 4526917^2 + 846838^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210112123133 - 2⁶ = 21210112123069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21210112123099 and 21210112123108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210112123183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605056061566 + 10605056061567.

It is an arithmetic number, because the mean of its divisors is an integer number (10605056061567).

Almost surely, 2^{21210112123133} is an apocalyptic number.

It is an amenable number.

21210112123133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210112123133 is an equidigital number, since it uses as much as digits as its factorization.

21210112123133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21210112123133 its reverse (33132121101212), we get a palindrome (54342233224345).

The spelling of 21210112123133 in words is "twenty-one trillion, two hundred ten billion, one hundred twelve million, one hundred twenty-three thousand, one hundred thirty-three".