123442502221 has 2 divisors, whose sum is σ = 123442502222. Its totient is φ = 123442502220.

The previous prime is 123442502189. The next prime is 123442502243. The reversal of 123442502221 is 122205244321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97525044100 + 25917458121 = 312290^2 + 160989^2 .

It is a cyclic number.

It is not a de Polignac number, because 123442502221 - 2⁵ = 123442502189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123442502221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123442502021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61721251110 + 61721251111.

It is an arithmetic number, because the mean of its divisors is an integer number (61721251111).

Almost surely, 2^123442502221 is an apocalyptic number.

It is an amenable number.

123442502221 is a deficient number, since it is larger than the sum of its proper divisors (1).

123442502221 is an equidigital number, since it uses as much as digits as its factorization.

123442502221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 123442502221 its reverse (122205244321), we get a palindrome (245647746542).

The spelling of 123442502221 in words is "one hundred twenty-three billion, four hundred forty-two million, five hundred two thousand, two hundred twenty-one".