12153221 has 2 divisors, whose sum is σ = 12153222. Its totient is φ = 12153220.

The previous prime is 12153203. The next prime is 12153247. The reversal of 12153221 is 12235121.

It is a happy number.

12153221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8584900 + 3568321 = 2930^2 + 1889^2 .

It is a cyclic number.

It is not a de Polignac number, because 12153221 - 2⁶ = 12153157 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12153221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12153121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6076610 + 6076611.

It is an arithmetic number, because the mean of its divisors is an integer number (6076611).

Almost surely, 2^12153221 is an apocalyptic number.

It is an amenable number.

12153221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12153221 is an equidigital number, since it uses as much as digits as its factorization.

12153221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120, while the sum is 17.

The square root of 12153221 is about 3486.1470135380. The cubic root of 12153221 is about 229.9131430069.

Adding to 12153221 its reverse (12235121), we get a palindrome (24388342).

The spelling of 12153221 in words is "twelve million, one hundred fifty-three thousand, two hundred twenty-one".