7521275221 has 8 divisors (see below), whose sum is σ = 7544193440. Its totient is φ = 7498392912.

The previous prime is 7521275207. The next prime is 7521275257. The reversal of 7521275221 is 1225721257.

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

It is a cyclic number.

It is not a de Polignac number, because 7521275221 - 2¹¹ = 7521273173 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 (7521270221) 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, 444706 + ... + 461308.

It is an arithmetic number, because the mean of its divisors is an integer number (943024180).

Almost surely, 2^7521275221 is an apocalyptic number.

It is an amenable number.

7521275221 is a deficient number, since it is larger than the sum of its proper divisors (22918219).

7521275221 is a wasteful number, since it uses less digits than its factorization.

7521275221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17955.

The product of its digits is 19600, while the sum is 34.

The square root of 7521275221 is about 86725.2859378394. The cubic root of 7521275221 is about 1959.2829548578.

Adding to 7521275221 its reverse (1225721257), we get a palindrome (8746996478).

The spelling of 7521275221 in words is "seven billion, five hundred twenty-one million, two hundred seventy-five thousand, two hundred twenty-one".