21102144103429 has 2 divisors, whose sum is σ = 21102144103430. Its totient is φ = 21102144103428.

The previous prime is 21102144103409. The next prime is 21102144103459. The reversal of 21102144103429 is 92430144120112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14982333972804 + 6119810130625 = 3870702^2 + 2473825^2 .

It is a cyclic number.

It is not a de Polignac number, because 21102144103429 - 2⁷ = 21102144103301 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21102144103394 and 21102144103403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102144103409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551072051714 + 10551072051715.

It is an arithmetic number, because the mean of its divisors is an integer number (10551072051715).

Almost surely, 2^{21102144103429} is an apocalyptic number.

It is an amenable number.

21102144103429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102144103429 is an equidigital number, since it uses as much as digits as its factorization.

21102144103429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 34.

The spelling of 21102144103429 in words is "twenty-one trillion, one hundred two billion, one hundred forty-four million, one hundred three thousand, four hundred twenty-nine".