2544001221 has 4 divisors (see below), whose sum is σ = 3392001632. Its totient is φ = 1696000812.

The previous prime is 2544001199. The next prime is 2544001237. The reversal of 2544001221 is 1221004452.

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 2544001221 - 2¹⁰ = 2544000197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2544001241) 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, 424000201 + ... + 424000206.

It is an arithmetic number, because the mean of its divisors is an integer number (848000408).

Almost surely, 2^2544001221 is an apocalyptic number.

It is an amenable number.

2544001221 is a deficient number, since it is larger than the sum of its proper divisors (848000411).

2544001221 is an equidigital number, since it uses as much as digits as its factorization.

2544001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848000410.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 2544001221 is about 50438.0929556223. The cubic root of 2544001221 is about 1365.1250577099.

Adding to 2544001221 its reverse (1221004452), we get a palindrome (3765005673).

The spelling of 2544001221 in words is "two billion, five hundred forty-four million, one thousand, two hundred twenty-one".