21103231330121 has 2 divisors, whose sum is σ = 21103231330122. Its totient is φ = 21103231330120.

The previous prime is 21103231330081. The next prime is 21103231330147. The reversal of 21103231330121 is 12103313230112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14045367721225 + 7057863608896 = 3747715^2 + 2656664^2 .

It is a cyclic number.

It is not a de Polignac number, because 21103231330121 - 2³⁴ = 21086051460937 is a prime.

It is not a weakly prime, because it can be changed into another prime (21103231330021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551615665060 + 10551615665061.

It is an arithmetic number, because the mean of its divisors is an integer number (10551615665061).

Almost surely, 2^{21103231330121} is an apocalyptic number.

It is an amenable number.

21103231330121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103231330121 is an equidigital number, since it uses as much as digits as its factorization.

21103231330121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21103231330121 its reverse (12103313230112), we get a palindrome (33206544560233).

The spelling of 21103231330121 in words is "twenty-one trillion, one hundred three billion, two hundred thirty-one million, three hundred thirty thousand, one hundred twenty-one".