2144455421 has 4 divisors (see below), whose sum is σ = 2145163644. Its totient is φ = 2143747200.

The previous prime is 2144455409. The next prime is 2144455433. The reversal of 2144455421 is 1245544412.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2144455409) and next prime (2144455433).

It can be written as a sum of positive squares in 2 ways, for example, as 1383468025 + 760987396 = 37195^2 + 27586^2 .

It is a cyclic number.

It is not a de Polignac number, because 2144455421 - 2³⁰ = 1070713597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2144455441) 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, 349550 + ... + 355631.

It is an arithmetic number, because the mean of its divisors is an integer number (536290911).

Almost surely, 2^2144455421 is an apocalyptic number.

It is an amenable number.

2144455421 is a deficient number, since it is larger than the sum of its proper divisors (708223).

2144455421 is an equidigital number, since it uses as much as digits as its factorization.

2144455421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708222.

The product of its digits is 25600, while the sum is 32.

The square root of 2144455421 is about 46308.2651478114. The cubic root of 2144455421 is about 1289.5524399355.

Adding to 2144455421 its reverse (1245544412), we get a palindrome (3389999833).

The spelling of 2144455421 in words is "two billion, one hundred forty-four million, four hundred fifty-five thousand, four hundred twenty-one".