311313011001221 has 4 divisors (see below), whose sum is σ = 311314590529452. Its totient is φ = 311311431472992.

The previous prime is 311313011001143. The next prime is 311313011001229. The reversal of 311313011001221 is 122100110313113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 142614086788996 + 168698924212225 = 11942114^2 + 12988415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311313011001221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311313011001193 and 311313011001202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311313011001229) 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, 789468440 + ... + 789862673.

It is an arithmetic number, because the mean of its divisors is an integer number (77828647632363).

Almost surely, 2^{311313011001221} is an apocalyptic number.

It is an amenable number.

311313011001221 is a deficient number, since it is larger than the sum of its proper divisors (1579528231).

311313011001221 is a wasteful number, since it uses less digits than its factorization.

311313011001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1579528230.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 311313011001221 its reverse (122100110313113), we get a palindrome (433413121314334).

The spelling of 311313011001221 in words is "three hundred eleven trillion, three hundred thirteen billion, eleven million, one thousand, two hundred twenty-one".