2181373693512 has 48 divisors (see below), whose sum is σ = 5905198027440. Its totient is φ = 671191904448.

The previous prime is 2181373693487. The next prime is 2181373693517. The reversal of 2181373693512 is 2153963731812.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2181373693517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 268902958 + ... + 268911069.

It is an arithmetic number, because the mean of its divisors is an integer number (123024958905).

Almost surely, 2^{2181373693512} is an apocalyptic number.

It is an amenable number.

2181373693512 is an abundant number, since it is smaller than the sum of its proper divisors (3723824333928).

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

2181373693512 is a wasteful number, since it uses less digits than its factorization.

2181373693512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537814062 (or 537814045 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 51.

The spelling of 2181373693512 in words is "two trillion, one hundred eighty-one billion, three hundred seventy-three million, six hundred ninety-three thousand, five hundred twelve".