123042204521 has 2 divisors, whose sum is σ = 123042204522. Its totient is φ = 123042204520.

The previous prime is 123042204511. The next prime is 123042204599. The reversal of 123042204521 is 125402240321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110050764121 + 12991440400 = 331739^2 + 113980^2 .

It is a cyclic number.

It is not a de Polignac number, because 123042204521 - 2¹⁸ = 123041942377 is a prime.

It is not a weakly prime, because it can be changed into another prime (123042204511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61521102260 + 61521102261.

It is an arithmetic number, because the mean of its divisors is an integer number (61521102261).

Almost surely, 2^123042204521 is an apocalyptic number.

It is an amenable number.

123042204521 is a deficient number, since it is larger than the sum of its proper divisors (1).

123042204521 is an equidigital number, since it uses as much as digits as its factorization.

123042204521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 123042204521 its reverse (125402240321), we get a palindrome (248444444842).

The spelling of 123042204521 in words is "one hundred twenty-three billion, forty-two million, two hundred four thousand, five hundred twenty-one".