123211321 has 2 divisors, whose sum is σ = 123211322. Its totient is φ = 123211320.

The previous prime is 123211307. The next prime is 123211327. The reversal of 123211321 is 123112321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83521321 + 39690000 = 9139^2 + 6300^2 .

It is an emirp because it is prime and its reverse (123112321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123211321 - 2⁵ = 123211289 is a prime.

It is equal to p_7014022 and since 123211321 and 7014022 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 123211295 and 123211304.

It is not a weakly prime, because it can be changed into another prime (123211327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61605660 + 61605661.

It is an arithmetic number, because the mean of its divisors is an integer number (61605661).

Almost surely, 2^123211321 is an apocalyptic number.

It is an amenable number.

123211321 is a deficient number, since it is larger than the sum of its proper divisors (1).

123211321 is an equidigital number, since it uses as much as digits as its factorization.

123211321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 16.

The square root of 123211321 is about 11100.0595043450. The cubic root of 123211321 is about 497.6036278159.

Adding to 123211321 its reverse (123112321), we get a palindrome (246323642).

The spelling of 123211321 in words is "one hundred twenty-three million, two hundred eleven thousand, three hundred twenty-one".