2131220320 has 48 divisors (see below), whose sum is σ = 5081242320. Its totient is φ = 844660224.

The previous prime is 2131220263. The next prime is 2131220321. The reversal of 2131220320 is 230221312.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 2131220294 and 2131220303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131220321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43662 + ... + 78541.

It is an arithmetic number, because the mean of its divisors is an integer number (105859215).

Almost surely, 2^2131220320 is an apocalyptic number.

2131220320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131220320 is an abundant number, since it is smaller than the sum of its proper divisors (2950022000).

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

2131220320 is a wasteful number, since it uses less digits than its factorization.

2131220320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122327 (or 122319 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 2131220320 is about 46165.1418280070. The cubic root of 2131220320 is about 1286.8940199185.

Adding to 2131220320 its reverse (230221312), we get a palindrome (2361441632).

The spelling of 2131220320 in words is "two billion, one hundred thirty-one million, two hundred twenty thousand, three hundred twenty".