2144708721 has 27 divisors (see below), whose sum is σ = 3180491769. Its totient is φ = 1392664392.

The previous prime is 2144708711. The next prime is 2144708773. The reversal of 2144708721 is 1278074412.

The square root of 2144708721 is 46311.

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

It is not a de Polignac number, because 2144708721 - 2¹¹ = 2144706673 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2144708711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5973940 + ... + 5974298.

Almost surely, 2^2144708721 is an apocalyptic number.

2144708721 is the 46311-st square number.

2144708721 is the 23156-th centered octagonal number.

It is an amenable number.

2144708721 is a deficient number, since it is larger than the sum of its proper divisors (1035783048).

2144708721 is an frugal number, since it uses more digits than its factorization.

2144708721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The cubic root of 2144708721 is about 1289.6032112983.

Multiplying 2144708721 by its sum of digits (36), we get a square (77209513956 = 277866²).

The spelling of 2144708721 in words is "two billion, one hundred forty-four million, seven hundred eight thousand, seven hundred twenty-one".