1223121001321 has 2 divisors, whose sum is σ = 1223121001322. Its totient is φ = 1223121001320.

The previous prime is 1223121001313. The next prime is 1223121001327. The reversal of 1223121001321 is 1231001213221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1187271744400 + 35849256921 = 1089620^2 + 189339^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223121001321 - 2³ = 1223121001313 is a prime.

It is not a weakly prime, because it can be changed into another prime (1223121001327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611560500660 + 611560500661.

It is an arithmetic number, because the mean of its divisors is an integer number (611560500661).

Almost surely, 2^{1223121001321} is an apocalyptic number.

It is an amenable number.

1223121001321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223121001321 is an equidigital number, since it uses as much as digits as its factorization.

1223121001321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1223121001321 its reverse (1231001213221), we get a palindrome (2454122214542).

The spelling of 1223121001321 in words is "one trillion, two hundred twenty-three billion, one hundred twenty-one million, one thousand, three hundred twenty-one".