311220253420 has 48 divisors (see below), whose sum is σ = 661020030720. Its totient is φ = 123068109824.

The previous prime is 311220253369. The next prime is 311220253429. The reversal of 311220253420 is 24352022113.

It is a super-2 number, since 2×311220253420² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (311220253429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13903077 + ... + 13925443.

It is an arithmetic number, because the mean of its divisors is an integer number (13771250640).

Almost surely, 2^311220253420 is an apocalyptic number.

It is an amenable number.

311220253420 is an abundant number, since it is smaller than the sum of its proper divisors (349799777300).

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

311220253420 is a wasteful number, since it uses less digits than its factorization.

311220253420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30282 (or 30280 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 311220253420 its reverse (24352022113), we get a palindrome (335572275533).

The spelling of 311220253420 in words is "three hundred eleven billion, two hundred twenty million, two hundred fifty-three thousand, four hundred twenty".