123540324221 has 2 divisors, whose sum is σ = 123540324222. Its totient is φ = 123540324220.

The previous prime is 123540324217. The next prime is 123540324241. The reversal of 123540324221 is 122423045321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73719852196 + 49820472025 = 271514^2 + 223205^2 .

It is a cyclic number.

It is not a de Polignac number, because 123540324221 - 2² = 123540324217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123540324241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61770162110 + 61770162111.

It is an arithmetic number, because the mean of its divisors is an integer number (61770162111).

Almost surely, 2^123540324221 is an apocalyptic number.

It is an amenable number.

123540324221 is a deficient number, since it is larger than the sum of its proper divisors (1).

123540324221 is an equidigital number, since it uses as much as digits as its factorization.

123540324221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 123540324221 its reverse (122423045321), we get a palindrome (245963369542).

The spelling of 123540324221 in words is "one hundred twenty-three billion, five hundred forty million, three hundred twenty-four thousand, two hundred twenty-one".