311220123500000 has 1344 divisors, whose sum is σ = 952845478421760. Its totient is φ = 98371584000000.

The previous prime is 311220123499939. The next prime is 311220123500003. The reversal of 311220123500000 is 5321022113.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311220123500003) by changing a digit.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 262190499407 + ... + 262190500593.

It is an arithmetic number, because the mean of its divisors is an integer number (708962409540).

Almost surely, 2^{311220123500000} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 311220123500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (476422739210880).

311220123500000 is an abundant number, since it is smaller than the sum of its proper divisors (641625354921760).

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

311220123500000 is a wasteful number, since it uses less digits than its factorization.

311220123500000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1463 (or 1430 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 311220123500000 its reverse (5321022113), we get a palindrome (311225444522113).

The spelling of 311220123500000 in words is "three hundred eleven trillion, two hundred twenty billion, one hundred twenty-three million, five hundred thousand".