2131312122220 has 48 divisors (see below), whose sum is σ = 4543015232448. Its totient is φ = 839799161600.

The previous prime is 2131312122209. The next prime is 2131312122221. The reversal of 2131312122220 is 222212131312.

It is a junction number, because it is equal to n+sod(n) for n = 2131312122191 and 2131312122200.

It is not an unprimeable number, because it can be changed into a prime (2131312122221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2279992 + ... + 3075871.

It is an arithmetic number, because the mean of its divisors is an integer number (94646150676).

Almost surely, 2^{2131312122220} is an apocalyptic number.

2131312122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131312122220 is an abundant number, since it is smaller than the sum of its proper divisors (2411703110228).

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

2131312122220 is a wasteful number, since it uses less digits than its factorization.

2131312122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5356170 (or 5356168 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 2131312122220 its reverse (222212131312), we get a palindrome (2353524253532).

The spelling of 2131312122220 in words is "two trillion, one hundred thirty-one billion, three hundred twelve million, one hundred twenty-two thousand, two hundred twenty".