123122221 has 4 divisors (see below), whose sum is σ = 126125244. Its totient is φ = 120119200.

The previous prime is 123122189. The next prime is 123122231. The reversal of 123122221 is 122221321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122221321 = 7103 ⋅17207.

It can be written as a sum of positive squares in 2 ways, for example, as 30096196 + 93026025 = 5486^2 + 9645^2 .

It is a cyclic number.

It is not a de Polignac number, because 123122221 - 2⁵ = 123122189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123122195 and 123122204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123122231) 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, 1501450 + ... + 1501531.

It is an arithmetic number, because the mean of its divisors is an integer number (31531311).

Almost surely, 2^123122221 is an apocalyptic number.

It is an amenable number.

123122221 is a deficient number, since it is larger than the sum of its proper divisors (3003023).

123122221 is an equidigital number, since it uses as much as digits as its factorization.

123122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3003022.

The product of its digits is 96, while the sum is 16.

The square root of 123122221 is about 11096.0452864973. The cubic root of 123122221 is about 497.4836518958.

Adding to 123122221 its reverse (122221321), we get a palindrome (245343542).

The spelling of 123122221 in words is "one hundred twenty-three million, one hundred twenty-two thousand, two hundred twenty-one".