126321120109 has 2 divisors, whose sum is σ = 126321120110. Its totient is φ = 126321120108.

The previous prime is 126321120083. The next prime is 126321120113. The reversal of 126321120109 is 901021123621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80657704009 + 45663416100 = 284003^2 + 213690^2 .

It is an emirp because it is prime and its reverse (901021123621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126321120109 - 2²¹ = 126319022957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126321120169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63160560054 + 63160560055.

It is an arithmetic number, because the mean of its divisors is an integer number (63160560055).

Almost surely, 2^126321120109 is an apocalyptic number.

It is an amenable number.

126321120109 is a deficient number, since it is larger than the sum of its proper divisors (1).

126321120109 is an equidigital number, since it uses as much as digits as its factorization.

126321120109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 126321120109 in words is "one hundred twenty-six billion, three hundred twenty-one million, one hundred twenty thousand, one hundred nine".