311012021221 has 16 divisors (see below), whose sum is σ = 339807424320. Its totient is φ = 282303895680.

The previous prime is 311012021207. The next prime is 311012021249. The reversal of 311012021221 is 122120210113.

It is a cyclic number.

It is not a de Polignac number, because 311012021221 - 2¹¹ = 311012019173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311012021195 and 311012021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311012001221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21458145 + ... + 21472633.

It is an arithmetic number, because the mean of its divisors is an integer number (21237964020).

Almost surely, 2^311012021221 is an apocalyptic number.

It is an amenable number.

311012021221 is a deficient number, since it is larger than the sum of its proper divisors (28795403099).

311012021221 is a wasteful number, since it uses less digits than its factorization.

311012021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17364.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 311012021221 its reverse (122120210113), we get a palindrome (433132231334).

The spelling of 311012021221 in words is "three hundred eleven billion, twelve million, twenty-one thousand, two hundred twenty-one".