123983732221 has 2 divisors, whose sum is σ = 123983732222. Its totient is φ = 123983732220.

The previous prime is 123983732207. The next prime is 123983732231. The reversal of 123983732221 is 122237389321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68471188900 + 55512543321 = 261670^2 + 235611^2 .

It is a cyclic number.

It is not a de Polignac number, because 123983732221 - 2⁹ = 123983731709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123983732231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61991866110 + 61991866111.

It is an arithmetic number, because the mean of its divisors is an integer number (61991866111).

Almost surely, 2^123983732221 is an apocalyptic number.

It is an amenable number.

123983732221 is a deficient number, since it is larger than the sum of its proper divisors (1).

123983732221 is an equidigital number, since it uses as much as digits as its factorization.

123983732221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 43.

The spelling of 123983732221 in words is "one hundred twenty-three billion, nine hundred eighty-three million, seven hundred thirty-two thousand, two hundred twenty-one".