2311222021220 has 24 divisors (see below), whose sum is σ = 5546932851264. Its totient is φ = 792418978656.

The previous prime is 2311222021217. The next prime is 2311222021237. The reversal of 2311222021220 is 221202221132.

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

It is a junction number, because it is equal to n+sod(n) for n = 2311222021192 and 2311222021201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8254364222 + ... + 8254364501.

It is an arithmetic number, because the mean of its divisors is an integer number (231122202136).

Almost surely, 2^{2311222021220} is an apocalyptic number.

2311222021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2311222021220 is an abundant number, since it is smaller than the sum of its proper divisors (3235710830044).

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

2311222021220 is a wasteful number, since it uses less digits than its factorization.

2311222021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16508728739 (or 16508728737 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 2311222021220 its reverse (221202221132), we get a palindrome (2532424242352).

The spelling of 2311222021220 in words is "two trillion, three hundred eleven billion, two hundred twenty-two million, twenty-one thousand, two hundred twenty".