21012122132123 has 2 divisors, whose sum is σ = 21012122132124. Its totient is φ = 21012122132122.

The previous prime is 21012122132117. The next prime is 21012122132137. The reversal of 21012122132123 is 32123122121012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21012122132123 - 2⁴ = 21012122132107 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012122132623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506061066061 + 10506061066062.

It is an arithmetic number, because the mean of its divisors is an integer number (10506061066062).

Almost surely, 2^{21012122132123} is an apocalyptic number.

21012122132123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012122132123 is an equidigital number, since it uses as much as digits as its factorization.

21012122132123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21012122132123 its reverse (32123122121012), we get a palindrome (53135244253135).

The spelling of 21012122132123 in words is "twenty-one trillion, twelve billion, one hundred twenty-two million, one hundred thirty-two thousand, one hundred twenty-three".