2543241221 has 4 divisors (see below), whose sum is σ = 2549952000. Its totient is φ = 2536530444.

The previous prime is 2543241179. The next prime is 2543241247. The reversal of 2543241221 is 1221423452.

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 a cyclic number.

It is not a de Polignac number, because 2543241221 - 2¹⁰ = 2543240197 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 (2543241821) 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, 3354821 + ... + 3355578.

It is an arithmetic number, because the mean of its divisors is an integer number (637488000).

Almost surely, 2^2543241221 is an apocalyptic number.

It is an amenable number.

2543241221 is a deficient number, since it is larger than the sum of its proper divisors (6710779).

2543241221 is an equidigital number, since it uses as much as digits as its factorization.

2543241221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6710778.

The product of its digits is 3840, while the sum is 26.

The square root of 2543241221 is about 50430.5584046023. The cubic root of 2543241221 is about 1364.9891041096.

Adding to 2543241221 its reverse (1221423452), we get a palindrome (3764664673).

The spelling of 2543241221 in words is "two billion, five hundred forty-three million, two hundred forty-one thousand, two hundred twenty-one".