1212210121321 has 2 divisors, whose sum is σ = 1212210121322. Its totient is φ = 1212210121320.

The previous prime is 1212210121313. The next prime is 1212210121327. The reversal of 1212210121321 is 1231210122121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 863152483600 + 349057637721 = 929060^2 + 590811^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212210121321 - 2³ = 1212210121313 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212210121327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606105060660 + 606105060661.

It is an arithmetic number, because the mean of its divisors is an integer number (606105060661).

Almost surely, 2^{1212210121321} is an apocalyptic number.

It is an amenable number.

1212210121321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212210121321 is an equidigital number, since it uses as much as digits as its factorization.

1212210121321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1212210121321 its reverse (1231210122121), we get a palindrome (2443420243442).

The spelling of 1212210121321 in words is "one trillion, two hundred twelve billion, two hundred ten million, one hundred twenty-one thousand, three hundred twenty-one".