2181478741812 has 24 divisors (see below), whose sum is σ = 5655685627200. Its totient is φ = 727159580568.

The previous prime is 2181478741787. The next prime is 2181478741823.

2181478741812 is a `hidden beast` number, since 2 + 1 + 8 + 147 + 87 + 418 + 1 + 2 = 666.

2181478741812 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10099438512 + ... + 10099438727.

It is an arithmetic number, because the mean of its divisors is an integer number (235653567800).

Almost surely, 2^{2181478741812} is an apocalyptic number.

It is an amenable number.

2181478741812 is an abundant number, since it is smaller than the sum of its proper divisors (3474206885388).

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

2181478741812 is a wasteful number, since it uses less digits than its factorization.

2181478741812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20198877252 (or 20198877244 counting only the distinct ones).

The product of its digits is 1605632, while the sum is 54.

The spelling of 2181478741812 in words is "two trillion, one hundred eighty-one billion, four hundred seventy-eight million, seven hundred forty-one thousand, eight hundred twelve".