2131122220 has 48 divisors (see below), whose sum is σ = 4561603200. Its totient is φ = 836179200.

The previous prime is 2131122199. The next prime is 2131122223. The reversal of 2131122220 is 222211312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2131122194 and 2131122203.

It is not an unprimeable number, because it can be changed into a prime (2131122223) 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, 215341 + ... + 225019.

It is an arithmetic number, because the mean of its divisors is an integer number (95033400).

Almost surely, 2^2131122220 is an apocalyptic number.

2131122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131122220 is an abundant number, since it is smaller than the sum of its proper divisors (2430480980).

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

2131122220 is a wasteful number, since it uses less digits than its factorization.

2131122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9898 (or 9896 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2131122220 is about 46164.0793258135. The cubic root of 2131122220 is about 1286.8742743860.

Adding to 2131122220 its reverse (222211312), we get a palindrome (2353333532).

The spelling of 2131122220 in words is "two billion, one hundred thirty-one million, one hundred twenty-two thousand, two hundred twenty".