2131220311 has 12 divisors (see below), whose sum is σ = 2392429536. Its totient is φ = 1896245120.

The previous prime is 2131220263. The next prime is 2131220321. The reversal of 2131220311 is 1130221312.

It is not a de Polignac number, because 2131220311 - 2⁹ = 2131219799 is a prime.

It is a Duffinian number.

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 11 ways as a sum of consecutive naturals, for example, 181690 + ... + 193063.

It is an arithmetic number, because the mean of its divisors is an integer number (199369128).

Almost surely, 2^2131220311 is an apocalyptic number.

2131220311 is a deficient number, since it is larger than the sum of its proper divisors (261209225).

2131220311 is a wasteful number, since it uses less digits than its factorization.

2131220311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374822 (or 374811 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2131220311 is about 46165.1417305308. The cubic root of 2131220311 is about 1286.8940181070.

Adding to 2131220311 its reverse (1130221312), we get a palindrome (3261441623).

The spelling of 2131220311 in words is "two billion, one hundred thirty-one million, two hundred twenty thousand, three hundred eleven".