12252221 has 4 divisors (see below), whose sum is σ = 12327552. Its totient is φ = 12176892.

The previous prime is 12252197. The next prime is 12252259. The reversal of 12252221 is 12225221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12252221 is a prime.

It is a super-4 number, since 4×12252221⁴ (a number of 29 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12252221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12252271) 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, 37421 + ... + 37746.

It is an arithmetic number, because the mean of its divisors is an integer number (3081888).

Almost surely, 2^12252221 is an apocalyptic number.

It is an amenable number.

12252221 is a deficient number, since it is larger than the sum of its proper divisors (75331).

12252221 is an equidigital number, since it uses as much as digits as its factorization.

12252221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75330.

The product of its digits is 160, while the sum is 17.

The square root of 12252221 is about 3500.3172713341. The cubic root of 12252221 is about 230.5357454332.

Adding to 12252221 its reverse (12225221), we get a palindrome (24477442).

Subtracting from 12252221 its reverse (12225221), we obtain a cube (27000 = 30³).

The spelling of 12252221 in words is "twelve million, two hundred fifty-two thousand, two hundred twenty-one".