1821427687872 has 112 divisors (see below), whose sum is σ = 5766557102880. Its totient is φ = 560439281664.

The previous prime is 1821427687867. The next prime is 1821427687927. The reversal of 1821427687872 is 2787867241281.

1821427687872 is a `hidden beast` number, since 1 + 8 + 214 + 276 + 87 + 8 + 72 = 666.

It is a congruent number.

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, 40518573 + ... + 40563500.

It is an arithmetic number, because the mean of its divisors is an integer number (51487116990).

Almost surely, 2^{1821427687872} is an apocalyptic number.

1821427687872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1821427687872 is an abundant number, since it is smaller than the sum of its proper divisors (3945129415008).

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

1821427687872 is a wasteful number, since it uses less digits than its factorization.

1821427687872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81082107 (or 81082091 counting only the distinct ones).

The product of its digits is 33718272, while the sum is 63.

The spelling of 1821427687872 in words is "one trillion, eight hundred twenty-one billion, four hundred twenty-seven million, six hundred eighty-seven thousand, eight hundred seventy-two".