21261162130116 has 36 divisors (see below), whose sum is σ = 52357820325552. Its totient is φ = 6714051197616.

The previous prime is 21261162130099. The next prime is 21261162130157. The reversal of 21261162130116 is 61103126116212.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2453961750 + ... + 2453970413.

It is an arithmetic number, because the mean of its divisors is an integer number (1454383897932).

Almost surely, 2^{21261162130116} is an apocalyptic number.

It is an amenable number.

21261162130116 is an abundant number, since it is smaller than the sum of its proper divisors (31096658195436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21261162130116 is a wasteful number, since it uses less digits than its factorization.

21261162130116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4907932208 (or 4907932187 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

Adding to 21261162130116 its reverse (61103126116212), we get a palindrome (82364288246328).

The spelling of 21261162130116 in words is "twenty-one trillion, two hundred sixty-one billion, one hundred sixty-two million, one hundred thirty thousand, one hundred sixteen".