2181268621812 has 24 divisors (see below), whose sum is σ = 5816716325056. Its totient is φ = 623219606208.

The previous prime is 2181268621801. The next prime is 2181268621867.

2181268621812 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12983741713 + ... + 12983741880.

Almost surely, 2^{2181268621812} is an apocalyptic number.

It is an amenable number.

2181268621812 is an abundant number, since it is smaller than the sum of its proper divisors (3635447703244).

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

2181268621812 is a wasteful number, since it uses less digits than its factorization.

2181268621812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25967483607 (or 25967483605 counting only the distinct ones).

The product of its digits is 294912, while the sum is 48.

The spelling of 2181268621812 in words is "two trillion, one hundred eighty-one billion, two hundred sixty-eight million, six hundred twenty-one thousand, eight hundred twelve".