123242221 has 4 divisors (see below), whose sum is σ = 124069500. Its totient is φ = 122414944.

The previous prime is 123242183. The next prime is 123242239. The reversal of 123242221 is 122242321.

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 49196196 + 74046025 = 7014^2 + 8605^2 .

It is a cyclic number.

It is not a de Polignac number, because 123242221 - 2¹⁵ = 123209453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123242261) 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, 413416 + ... + 413713.

It is an arithmetic number, because the mean of its divisors is an integer number (31017375).

Almost surely, 2^123242221 is an apocalyptic number.

It is an amenable number.

123242221 is a deficient number, since it is larger than the sum of its proper divisors (827279).

123242221 is an equidigital number, since it uses as much as digits as its factorization.

123242221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827278.

The product of its digits is 384, while the sum is 19.

The square root of 123242221 is about 11101.4513015191. The cubic root of 123242221 is about 497.6452221185.

Adding to 123242221 its reverse (122242321), we get a palindrome (245484542).

The spelling of 123242221 in words is "one hundred twenty-three million, two hundred forty-two thousand, two hundred twenty-one".