1321212322121 has 2 divisors, whose sum is σ = 1321212322122. Its totient is φ = 1321212322120.

The previous prime is 1321212322063. The next prime is 1321212322123. The reversal of 1321212322121 is 1212232121231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1154634062521 + 166578259600 = 1074539^2 + 408140^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321212322121 - 2⁶ = 1321212322057 is a prime.

Together with 1321212322123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1321212322123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660606161060 + 660606161061.

It is an arithmetic number, because the mean of its divisors is an integer number (660606161061).

Almost surely, 2^{1321212322121} is an apocalyptic number.

It is an amenable number.

1321212322121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321212322121 is an equidigital number, since it uses as much as digits as its factorization.

1321212322121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 23.

Adding to 1321212322121 its reverse (1212232121231), we get a palindrome (2533444443352).

The spelling of 1321212322121 in words is "one trillion, three hundred twenty-one billion, two hundred twelve million, three hundred twenty-two thousand, one hundred twenty-one".