123231221 has 4 divisors (see below), whose sum is σ = 124966944. Its totient is φ = 121495500.

The previous prime is 123231209. The next prime is 123231223. The reversal of 123231221 is 122132321.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122132321 = 113 ⋅1080817.

It is a cyclic number.

It is not a de Polignac number, because 123231221 - 2¹⁴ = 123214837 is a prime.

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 123231221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123231223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 867755 + ... + 867896.

It is an arithmetic number, because the mean of its divisors is an integer number (31241736).

Almost surely, 2^123231221 is an apocalyptic number.

It is an amenable number.

123231221 is a deficient number, since it is larger than the sum of its proper divisors (1735723).

123231221 is an equidigital number, since it uses as much as digits as its factorization.

123231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1735722.

The product of its digits is 144, while the sum is 17.

The square root of 123231221 is about 11100.9558597447. The cubic root of 123231221 is about 497.6304158823.

Adding to 123231221 its reverse (122132321), we get a palindrome (245363542).

The spelling of 123231221 in words is "one hundred twenty-three million, two hundred thirty-one thousand, two hundred twenty-one".