4221242521 has 8 divisors (see below), whose sum is σ = 4445608320. Its totient is φ = 3997096272.

The previous prime is 4221242513. The next prime is 4221242527. The reversal of 4221242521 is 1252421224.

It is a happy number.

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

It is not a de Polignac number, because 4221242521 - 2³ = 4221242513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4221242527) 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, 14650 + ... + 93043.

It is an arithmetic number, because the mean of its divisors is an integer number (555701040).

Almost surely, 2^4221242521 is an apocalyptic number.

It is an amenable number.

4221242521 is a deficient number, since it is larger than the sum of its proper divisors (224365799).

4221242521 is a wasteful number, since it uses less digits than its factorization.

4221242521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109775.

The product of its digits is 2560, while the sum is 25.

The square root of 4221242521 is about 64971.0898861948. The cubic root of 4221242521 is about 1616.1441755383.

Adding to 4221242521 its reverse (1252421224), we get a palindrome (5473663745).

The spelling of 4221242521 in words is "four billion, two hundred twenty-one million, two hundred forty-two thousand, five hundred twenty-one".