2144721 has 4 divisors (see below), whose sum is σ = 2859632. Its totient is φ = 1429812.

The previous prime is 2144719. The next prime is 2144729. The reversal of 2144721 is 1274412.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2144721 - 2¹ = 2144719 is a prime.

It is a D-number.

It is a Duffinian number.

2144721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2144729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 357451 + ... + 357456.

It is an arithmetic number, because the mean of its divisors is an integer number (714908).

2^2144721 is an apocalyptic number.

It is an amenable number.

2144721 is a deficient number, since it is larger than the sum of its proper divisors (714911).

2144721 is an equidigital number, since it uses as much as digits as its factorization.

2144721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714910.

The product of its digits is 448, while the sum is 21.

The square root of 2144721 is about 1464.4865994607. The cubic root of 2144721 is about 128.9605672395.

The spelling of 2144721 in words is "two million, one hundred forty-four thousand, seven hundred twenty-one".