123213223121 has 2 divisors, whose sum is σ = 123213223122. Its totient is φ = 123213223120.

The previous prime is 123213223073. The next prime is 123213223127. The reversal of 123213223121 is 121322312321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121773779521 + 1439443600 = 348961^2 + 37940^2 .

It is a cyclic number.

It is not a de Polignac number, because 123213223121 - 2⁶ = 123213223057 is a prime.

It is not a weakly prime, because it can be changed into another prime (123213223127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61606611560 + 61606611561.

It is an arithmetic number, because the mean of its divisors is an integer number (61606611561).

Almost surely, 2^123213223121 is an apocalyptic number.

It is an amenable number.

123213223121 is a deficient number, since it is larger than the sum of its proper divisors (1).

123213223121 is an equidigital number, since it uses as much as digits as its factorization.

123213223121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

Adding to 123213223121 its reverse (121322312321), we get a palindrome (244535535442).

The spelling of 123213223121 in words is "one hundred twenty-three billion, two hundred thirteen million, two hundred twenty-three thousand, one hundred twenty-one".