21186129826328 has 8 divisors (see below), whose sum is σ = 39723993424380. Its totient is φ = 10593064913160.

The previous prime is 21186129826283. The next prime is 21186129826349. The reversal of 21186129826328 is 82362892168112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1324133114138 + ... + 1324133114153.

Almost surely, 2^{21186129826328} is an apocalyptic number.

It is an amenable number.

21186129826328 is a deficient number, since it is larger than the sum of its proper divisors (18537863598052).

21186129826328 is a wasteful number, since it uses less digits than its factorization.

21186129826328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2648266228297 (or 2648266228293 counting only the distinct ones).

The product of its digits is 7962624, while the sum is 59.

The spelling of 21186129826328 in words is "twenty-one trillion, one hundred eighty-six billion, one hundred twenty-nine million, eight hundred twenty-six thousand, three hundred twenty-eight".