311220103021 has 4 divisors (see below), whose sum is σ = 324751411872. Its totient is φ = 297688794172.

The previous prime is 311220102931. The next prime is 311220103081. The reversal of 311220103021 is 120301022113.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120301022113 = 12401 ⋅9700913.

It is a cyclic number.

It is not a de Polignac number, because 311220103021 - 2¹⁵ = 311220070253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311220102986 and 311220103004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311220103081) 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, 6765654391 + ... + 6765654436.

It is an arithmetic number, because the mean of its divisors is an integer number (81187852968).

Almost surely, 2^311220103021 is an apocalyptic number.

It is an amenable number.

311220103021 is a deficient number, since it is larger than the sum of its proper divisors (13531308851).

311220103021 is a wasteful number, since it uses less digits than its factorization.

311220103021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13531308850.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 311220103021 its reverse (120301022113), we get a palindrome (431521125134).

The spelling of 311220103021 in words is "three hundred eleven billion, two hundred twenty million, one hundred three thousand, twenty-one".