123544086221 has 2 divisors, whose sum is σ = 123544086222. Its totient is φ = 123544086220.

The previous prime is 123544086109. The next prime is 123544086241. The reversal of 123544086221 is 122680445321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80167693321 + 43376392900 = 283139^2 + 208270^2 .

It is a cyclic number.

It is not a de Polignac number, because 123544086221 - 2¹⁴ = 123544069837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123544086241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61772043110 + 61772043111.

It is an arithmetic number, because the mean of its divisors is an integer number (61772043111).

Almost surely, 2^123544086221 is an apocalyptic number.

It is an amenable number.

123544086221 is a deficient number, since it is larger than the sum of its proper divisors (1).

123544086221 is an equidigital number, since it uses as much as digits as its factorization.

123544086221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92160, while the sum is 38.

The spelling of 123544086221 in words is "one hundred twenty-three billion, five hundred forty-four million, eighty-six thousand, two hundred twenty-one".