12881818821 has 16 divisors (see below), whose sum is σ = 17800574400. Its totient is φ = 8276556288.

The previous prime is 12881818819. The next prime is 12881818841.

12881818821 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12881818821 - 2¹ = 12881818819 is a prime.

It is a super-2 number, since 2×12881818821² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12881818841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87756 + ... + 182933.

It is an arithmetic number, because the mean of its divisors is an integer number (1112535900).

Almost surely, 2^12881818821 is an apocalyptic number.

It is an amenable number.

12881818821 is a deficient number, since it is larger than the sum of its proper divisors (4918755579).

12881818821 is a wasteful number, since it uses less digits than its factorization.

12881818821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271268.

The product of its digits is 131072, while the sum is 48.

The spelling of 12881818821 in words is "twelve billion, eight hundred eighty-one million, eight hundred eighteen thousand, eight hundred twenty-one".