121221321123223 has 2 divisors, whose sum is σ = 121221321123224. Its totient is φ = 121221321123222.

The previous prime is 121221321123179. The next prime is 121221321123251. The reversal of 121221321123223 is 322321123122121.

It is an a-pointer prime, because the next prime (121221321123251) can be obtained adding 121221321123223 to its sum of digits (28).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121221321123223 - 2²⁵ = 121221287568791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121221321123191 and 121221321123200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121221321123923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610660561611 + 60610660561612.

It is an arithmetic number, because the mean of its divisors is an integer number (60610660561612).

Almost surely, 2^{121221321123223} is an apocalyptic number.

121221321123223 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221321123223 is an equidigital number, since it uses as much as digits as its factorization.

121221321123223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

Adding to 121221321123223 its reverse (322321123122121), we get a palindrome (443542444245344).

The spelling of 121221321123223 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, three hundred twenty-one million, one hundred twenty-three thousand, two hundred twenty-three".