311220201000 has 128 divisors (see below), whose sum is σ = 972581500800. Its totient is φ = 82857484800.

The previous prime is 311220200959. The next prime is 311220201007. The reversal of 311220201000 is 102022113.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (311220201007) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1773204 + ... + 1940796.

It is an arithmetic number, because the mean of its divisors is an integer number (7598292975).

Almost surely, 2^311220201000 is an apocalyptic number.

311220201000 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 311220201000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (486290750400).

311220201000 is an abundant number, since it is smaller than the sum of its proper divisors (661361299800).

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

311220201000 is a wasteful number, since it uses less digits than its factorization.

311220201000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168236 (or 168222 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 311220201000 its reverse (102022113), we get a palindrome (311322223113).

The spelling of 311220201000 in words is "three hundred eleven billion, two hundred twenty million, two hundred one thousand".