21102102134473 has 2 divisors, whose sum is σ = 21102102134474. Its totient is φ = 21102102134472.

The previous prime is 21102102134471. The next prime is 21102102134549. The reversal of 21102102134473 is 37443120120112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14218389649984 + 6883712484489 = 3770728^2 + 2623683^2 .

It is a cyclic number.

It is not a de Polignac number, because 21102102134473 - 2¹ = 21102102134471 is a prime.

Together with 21102102134471, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21102102134471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551051067236 + 10551051067237.

It is an arithmetic number, because the mean of its divisors is an integer number (10551051067237).

Almost surely, 2^{21102102134473} is an apocalyptic number.

It is an amenable number.

21102102134473 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102102134473 is an equidigital number, since it uses as much as digits as its factorization.

21102102134473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

Adding to 21102102134473 its reverse (37443120120112), we get a palindrome (58545222254585).

The spelling of 21102102134473 in words is "twenty-one trillion, one hundred two billion, one hundred two million, one hundred thirty-four thousand, four hundred seventy-three".