123020221997 has 2 divisors, whose sum is σ = 123020221998. Its totient is φ = 123020221996.

The previous prime is 123020221991. The next prime is 123020222041. The reversal of 123020221997 is 799122020321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116940745156 + 6079476841 = 341966^2 + 77971^2 .

It is a cyclic number.

It is not a de Polignac number, because 123020221997 - 2⁴ = 123020221981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123020221997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123020221991) 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, 61510110998 + 61510110999.

It is an arithmetic number, because the mean of its divisors is an integer number (61510110999).

Almost surely, 2^123020221997 is an apocalyptic number.

It is an amenable number.

123020221997 is a deficient number, since it is larger than the sum of its proper divisors (1).

123020221997 is an equidigital number, since it uses as much as digits as its factorization.

123020221997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 38.

The spelling of 123020221997 in words is "one hundred twenty-three billion, twenty million, two hundred twenty-one thousand, nine hundred ninety-seven".