2521240221 has 8 divisors (see below), whose sum is σ = 3368083360. Its totient is φ = 1677611952.

The previous prime is 2521240219. The next prime is 2521240237. The reversal of 2521240221 is 1220421252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2521240221 - 2¹ = 2521240219 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 (2521240291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 801886 + ... + 805023.

It is an arithmetic number, because the mean of its divisors is an integer number (421010420).

Almost surely, 2^2521240221 is an apocalyptic number.

It is an amenable number.

2521240221 is a deficient number, since it is larger than the sum of its proper divisors (846843139).

2521240221 is a wasteful number, since it uses less digits than its factorization.

2521240221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1607435.

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

The square root of 2521240221 is about 50211.9529693877. The cubic root of 2521240221 is about 1361.0416293799.

Adding to 2521240221 its reverse (1220421252), we get a palindrome (3741661473).

The spelling of 2521240221 in words is "two billion, five hundred twenty-one million, two hundred forty thousand, two hundred twenty-one".