13021271766 has 24 divisors (see below), whose sum is σ = 28227426240. Its totient is φ = 4338166896.

The previous prime is 13021271743. The next prime is 13021271779. The reversal of 13021271766 is 66717212031.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 13021271766.

It is a congruent number.

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, 152326 + ... + 221913.

It is an arithmetic number, because the mean of its divisors is an integer number (1176142760).

Almost surely, 2^13021271766 is an apocalyptic number.

13021271766 is an abundant number, since it is smaller than the sum of its proper divisors (15206154474).

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

13021271766 is a wasteful number, since it uses less digits than its factorization.

13021271766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376180 (or 376177 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

Adding to 13021271766 its reverse (66717212031), we get a palindrome (79738483797).

The spelling of 13021271766 in words is "thirteen billion, twenty-one million, two hundred seventy-one thousand, seven hundred sixty-six".