311220321000013 has 4 divisors (see below), whose sum is σ = 321952056206940. Its totient is φ = 300488585793088.

The previous prime is 311220320999971. The next prime is 311220321000097. The reversal of 311220321000013 is 310000123022113.

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 262956483060489 + 48263837939524 = 16215933^2 + 6947218^2 .

It is a cyclic number.

It is not a de Polignac number, because 311220321000013 - 2¹³ = 311220320991821 is a prime.

It is a super-2 number, since 2×311220321000013² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311220321000613) 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, 5365867603420 + ... + 5365867603477.

It is an arithmetic number, because the mean of its divisors is an integer number (80488014051735).

Almost surely, 2^{311220321000013} is an apocalyptic number.

It is an amenable number.

311220321000013 is a deficient number, since it is larger than the sum of its proper divisors (10731735206927).

311220321000013 is a wasteful number, since it uses less digits than its factorization.

311220321000013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10731735206926.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 311220321000013 its reverse (310000123022113), we get a palindrome (621220444022126).

The spelling of 311220321000013 in words is "three hundred eleven trillion, two hundred twenty billion, three hundred twenty-one million, thirteen", and thus it is an aban number.