311322120221221 has 4 divisors (see below), whose sum is σ = 311340179413600. Its totient is φ = 311304061028844.

The previous prime is 311322120221209. The next prime is 311322120221257. The reversal of 311322120221221 is 122122021223113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 311322120221221 - 2¹⁹ = 311322119696933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311322120222221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9029570331 + ... + 9029604808.

It is an arithmetic number, because the mean of its divisors is an integer number (77835044853400).

Almost surely, 2^{311322120221221} is an apocalyptic number.

It is an amenable number.

311322120221221 is a deficient number, since it is larger than the sum of its proper divisors (18059192379).

311322120221221 is a wasteful number, since it uses less digits than its factorization.

311322120221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18059192378.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 311322120221221 its reverse (122122021223113), we get a palindrome (433444141444334).

The spelling of 311322120221221 in words is "three hundred eleven trillion, three hundred twenty-two billion, one hundred twenty million, two hundred twenty-one thousand, two hundred twenty-one".