123223021 has 4 divisors (see below), whose sum is σ = 130471452. Its totient is φ = 115974592.

The previous prime is 123223007. The next prime is 123223031. The reversal of 123223021 is 120322321.

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 108889225 + 14333796 = 10435^2 + 3786^2 .

It is a cyclic number.

It is not a de Polignac number, because 123223021 - 2¹⁹ = 122698733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123222986 and 123223004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123223031) 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, 3624190 + ... + 3624223.

It is an arithmetic number, because the mean of its divisors is an integer number (32617863).

Almost surely, 2^123223021 is an apocalyptic number.

It is an amenable number.

123223021 is a deficient number, since it is larger than the sum of its proper divisors (7248431).

123223021 is an equidigital number, since it uses as much as digits as its factorization.

123223021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7248430.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 123223021 is about 11100.5865160360. The cubic root of 123223021 is about 497.6193779329.

Adding to 123223021 its reverse (120322321), we get a palindrome (243545342).

The spelling of 123223021 in words is "one hundred twenty-three million, two hundred twenty-three thousand, twenty-one".