311221331202113 has 4 divisors (see below), whose sum is σ = 311222559119280. Its totient is φ = 311220103284948.

The previous prime is 311221331202083. The next prime is 311221331202121. The reversal of 311221331202113 is 311202133122113.

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 311221331202113 - 2¹² = 311221331198017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311221331252113) 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, 613578323 + ... + 614085336.

It is an arithmetic number, because the mean of its divisors is an integer number (77805639779820).

Almost surely, 2^{311221331202113} is an apocalyptic number.

It is an amenable number.

311221331202113 is a deficient number, since it is larger than the sum of its proper divisors (1227917167).

311221331202113 is a wasteful number, since it uses less digits than its factorization.

311221331202113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227917166.

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 311221331202113 its reverse (311202133122113), we get a palindrome (622423464324226).

The spelling of 311221331202113 in words is "three hundred eleven trillion, two hundred twenty-one billion, three hundred thirty-one million, two hundred two thousand, one hundred thirteen".