311221200020 has 48 divisors (see below), whose sum is σ = 674078969088. Its totient is φ = 120633417600.

The previous prime is 311221200007. The next prime is 311221200053. The reversal of 311221200020 is 20002122113.

It is a happy number.

It is a super-3 number, since 3×311221200020³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 311221199968 and 311221200004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1544102 + ... + 1733981.

It is an arithmetic number, because the mean of its divisors is an integer number (14043311856).

Almost surely, 2^311221200020 is an apocalyptic number.

It is an amenable number.

311221200020 is an abundant number, since it is smaller than the sum of its proper divisors (362857769068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

311221200020 is a wasteful number, since it uses less digits than its factorization.

311221200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3278240 (or 3278238 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 311221200020 its reverse (20002122113), we get a palindrome (331223322133).

The spelling of 311221200020 in words is "three hundred eleven billion, two hundred twenty-one million, two hundred thousand, twenty".