7512221 has 8 divisors (see below), whose sum is σ = 7762944. Its totient is φ = 7264080.

The previous prime is 7512217. The next prime is 7512289. The reversal of 7512221 is 1222157.

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 7512221 - 2² = 7512217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7512193 and 7512202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7512721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6536 + ... + 7598.

It is an arithmetic number, because the mean of its divisors is an integer number (970368).

Almost surely, 2^7512221 is an apocalyptic number.

It is an amenable number.

7512221 is a deficient number, since it is larger than the sum of its proper divisors (250723).

7512221 is a wasteful number, since it uses less digits than its factorization.

7512221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291.

The product of its digits is 280, while the sum is 20.

The square root of 7512221 is about 2740.8431184583. The cubic root of 7512221 is about 195.8496434683.

Adding to 7512221 its reverse (1222157), we get a palindrome (8734378).

Subtracting from 7512221 its reverse (1222157), we obtain a square (6290064 = 2508²).

The spelling of 7512221 in words is "seven million, five hundred twelve thousand, two hundred twenty-one".