2523440221 has 4 divisors (see below), whose sum is σ = 2523546844. Its totient is φ = 2523333600.

The previous prime is 2523440209. The next prime is 2523440261. The reversal of 2523440221 is 1220443252.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1402128025 + 1121312196 = 37445^2 + 33486^2 .

It is a cyclic number.

It is not a de Polignac number, because 2523440221 - 2²³ = 2515051613 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 (2523440201) 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, 120 + ... + 71041.

It is an arithmetic number, because the mean of its divisors is an integer number (630886711).

Almost surely, 2^2523440221 is an apocalyptic number.

It is an amenable number.

2523440221 is a deficient number, since it is larger than the sum of its proper divisors (106623).

2523440221 is an equidigital number, since it uses as much as digits as its factorization.

2523440221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106622.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 2523440221 is about 50233.8553268610. The cubic root of 2523440221 is about 1361.4373897754.

Adding to 2523440221 its reverse (1220443252), we get a palindrome (3743883473).

The spelling of 2523440221 in words is "two billion, five hundred twenty-three million, four hundred forty thousand, two hundred twenty-one".