121321123109 has 2 divisors, whose sum is σ = 121321123110. Its totient is φ = 121321123108.

The previous prime is 121321123057. The next prime is 121321123117. The reversal of 121321123109 is 901321123121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121110960100 + 210163009 = 348010^2 + 14497^2 .

It is a cyclic number.

It is not a de Polignac number, because 121321123109 - 2¹² = 121321119013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121321123129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60660561554 + 60660561555.

It is an arithmetic number, because the mean of its divisors is an integer number (60660561555).

Almost surely, 2^121321123109 is an apocalyptic number.

It is an amenable number.

121321123109 is a deficient number, since it is larger than the sum of its proper divisors (1).

121321123109 is an equidigital number, since it uses as much as digits as its factorization.

121321123109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 26.

The spelling of 121321123109 in words is "one hundred twenty-one billion, three hundred twenty-one million, one hundred twenty-three thousand, one hundred nine".