7552212221 has 4 divisors (see below), whose sum is σ = 7552428444. Its totient is φ = 7551996000.

The previous prime is 7552212203. The next prime is 7552212251. The reversal of 7552212221 is 1222122557.

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 6377779321 + 1174432900 = 79861^2 + 34270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7552212221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7552212251) 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, 42410 + ... + 130011.

It is an arithmetic number, because the mean of its divisors is an integer number (1888107111).

Almost surely, 2^7552212221 is an apocalyptic number.

It is an amenable number.

7552212221 is a deficient number, since it is larger than the sum of its proper divisors (216223).

7552212221 is a wasteful number, since it uses less digits than its factorization.

7552212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216222.

The product of its digits is 5600, while the sum is 29.

The square root of 7552212221 is about 86903.4649539361. The cubic root of 7552212221 is about 1961.9656301920.

Adding to 7552212221 its reverse (1222122557), we get a palindrome (8774334778).

The spelling of 7552212221 in words is "seven billion, five hundred fifty-two million, two hundred twelve thousand, two hundred twenty-one".