2181308031812 has 48 divisors (see below), whose sum is σ = 4902471581952. Its totient is φ = 825416127360.

The previous prime is 2181308031731. The next prime is 2181308031821.

2181308031812 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130265639 + ... + 130282382.

It is an arithmetic number, because the mean of its divisors is an integer number (102134824624).

Almost surely, 2^{2181308031812} is an apocalyptic number.

It is an amenable number.

2181308031812 is an abundant number, since it is smaller than the sum of its proper divisors (2721163550140).

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

2181308031812 is a wasteful number, since it uses less digits than its factorization.

2181308031812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260548068 (or 260548066 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The spelling of 2181308031812 in words is "two trillion, one hundred eighty-one billion, three hundred eight million, thirty-one thousand, eight hundred twelve".