1212320123221 has 2 divisors, whose sum is σ = 1212320123222. Its totient is φ = 1212320123220.

The previous prime is 1212320123177. The next prime is 1212320123351. The reversal of 1212320123221 is 1223210232121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1113529347121 + 98790776100 = 1055239^2 + 314310^2 .

It is an emirp because it is prime and its reverse (1223210232121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1212320123221 - 2⁷ = 1212320123093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212320123192 and 1212320123201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212320103221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606160061610 + 606160061611.

It is an arithmetic number, because the mean of its divisors is an integer number (606160061611).

Almost surely, 2^{1212320123221} is an apocalyptic number.

It is an amenable number.

1212320123221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212320123221 is an equidigital number, since it uses as much as digits as its factorization.

1212320123221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 1212320123221 its reverse (1223210232121), we get a palindrome (2435530355342).

The spelling of 1212320123221 in words is "one trillion, two hundred twelve billion, three hundred twenty million, one hundred twenty-three thousand, two hundred twenty-one".