21102102134429 has 2 divisors, whose sum is σ = 21102102134430. Its totient is φ = 21102102134428.

The previous prime is 21102102134383. The next prime is 21102102134447. The reversal of 21102102134429 is 92443120120112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18651083316100 + 2451018818329 = 4318690^2 + 1565573^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21102102134429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21102102134395 and 21102102134404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102102134459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551051067214 + 10551051067215.

It is an arithmetic number, because the mean of its divisors is an integer number (10551051067215).

Almost surely, 2^{21102102134429} is an apocalyptic number.

It is an amenable number.

21102102134429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102102134429 is an equidigital number, since it uses as much as digits as its factorization.

21102102134429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The spelling of 21102102134429 in words is "twenty-one trillion, one hundred two billion, one hundred two million, one hundred thirty-four thousand, four hundred twenty-nine".