2521044221 has 4 divisors (see below), whose sum is σ = 2521172700. Its totient is φ = 2520915744.

The previous prime is 2521044193. The next prime is 2521044277. The reversal of 2521044221 is 1224401252.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2461152100 + 59892121 = 49610^2 + 7739^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521044221 - 2⁶ = 2521044157 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 (2521044821) 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, 27986 + ... + 76323.

It is an arithmetic number, because the mean of its divisors is an integer number (630293175).

Almost surely, 2^2521044221 is an apocalyptic number.

It is an amenable number.

2521044221 is a deficient number, since it is larger than the sum of its proper divisors (128479).

2521044221 is a wasteful number, since it uses less digits than its factorization.

2521044221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128478.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 2521044221 is about 50210.0012049392. The cubic root of 2521044221 is about 1361.0063595591.

Adding to 2521044221 its reverse (1224401252), we get a palindrome (3745445473).

The spelling of 2521044221 in words is "two billion, five hundred twenty-one million, forty-four thousand, two hundred twenty-one".