2181603861200 has 60 divisors (see below), whose sum is σ = 5313102022668. Its totient is φ = 860687539200.

The previous prime is 2181603861191. The next prime is 2181603861259. The reversal of 2181603861200 is 21683061812.

It can be written as a sum of positive squares in 6 ways, for example, as 68022899344 + 2113580961856 = 260812^2 + 1453816^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37327031 + ... + 37385430.

Almost surely, 2^{2181603861200} is an apocalyptic number.

2181603861200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2181603861200 is an abundant number, since it is smaller than the sum of its proper divisors (3131498161468).

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

2181603861200 is a wasteful number, since it uses less digits than its factorization.

2181603861200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74712552 (or 74712541 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The spelling of 2181603861200 in words is "two trillion, one hundred eighty-one billion, six hundred three million, eight hundred sixty-one thousand, two hundred".