321212112121 has 2 divisors, whose sum is σ = 321212112122. Its totient is φ = 321212112120.

The previous prime is 321212112113. The next prime is 321212112131. The reversal of 321212112121 is 121211212123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 314519072400 + 6693039721 = 560820^2 + 81811^2 .

It is a cyclic number.

It is not a de Polignac number, because 321212112121 - 2³ = 321212112113 is a prime.

It is not a weakly prime, because it can be changed into another prime (321212112131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160606056060 + 160606056061.

It is an arithmetic number, because the mean of its divisors is an integer number (160606056061).

Almost surely, 2^321212112121 is an apocalyptic number.

It is an amenable number.

321212112121 is a deficient number, since it is larger than the sum of its proper divisors (1).

321212112121 is an equidigital number, since it uses as much as digits as its factorization.

321212112121 is an evil number, because the sum of its binary digits is even.

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

Adding to 321212112121 its reverse (121211212123), we get a palindrome (442423324244).

The spelling of 321212112121 in words is "three hundred twenty-one billion, two hundred twelve million, one hundred twelve thousand, one hundred twenty-one".