2181493552144 has 15 divisors (see below), whose sum is σ = 4226655203967. Its totient is φ = 1090743822096.

The previous prime is 2181493552129. The next prime is 2181493552237. The reversal of 2181493552144 is 4412553941812.

It is a happy number.

The square root of 2181493552144 is 1476988.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian 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 2 ways as a sum of consecutive naturals, for example, 5723329 + ... + 6092575.

Almost surely, 2^{2181493552144} is an apocalyptic number.

2181493552144 is the 1476988-th square number.

It is an amenable number.

2181493552144 is a deficient number, since it is larger than the sum of its proper divisors (2045161651823).

2181493552144 is an frugal number, since it uses more digits than its factorization.

2181493552144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738502 (or 369249 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 49.

Multiplying 2181493552144 by its sum of digits (49), we get a square (106893184055056 = 10338916²).

The spelling of 2181493552144 in words is "two trillion, one hundred eighty-one billion, four hundred ninety-three million, five hundred fifty-two thousand, one hundred forty-four".