311221331202121 has 2 divisors, whose sum is σ = 311221331202122. Its totient is φ = 311221331202120.

The previous prime is 311221331202083. The next prime is 311221331202247. The reversal of 311221331202121 is 121202133122113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 284868909363600 + 26352421838521 = 16878060^2 + 5133461^2 .

It is a cyclic number.

It is not a de Polignac number, because 311221331202121 - 2⁴³ = 302425238179913 is a prime.

It is not a weakly prime, because it can be changed into another prime (311221331272121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155610665601060 + 155610665601061.

It is an arithmetic number, because the mean of its divisors is an integer number (155610665601061).

Almost surely, 2^{311221331202121} is an apocalyptic number.

It is an amenable number.

311221331202121 is a deficient number, since it is larger than the sum of its proper divisors (1).

311221331202121 is an equidigital number, since it uses as much as digits as its factorization.

311221331202121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 311221331202121 its reverse (121202133122113), we get a palindrome (432423464324234).

The spelling of 311221331202121 in words is "three hundred eleven trillion, two hundred twenty-one billion, three hundred thirty-one million, two hundred two thousand, one hundred twenty-one".