2131213365 has 12 divisors (see below), whose sum is σ = 3694103244. Its totient is φ = 1136647104.

The previous prime is 2131213361. The next prime is 2131213367. The reversal of 2131213365 is 5633121312.

It can be written as a sum of positive squares in 2 ways, for example, as 300571569 + 1830641796 = 17337^2 + 42786^2 .

It is not a de Polignac number, because 2131213365 - 2² = 2131213361 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131213361) 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 11 ways as a sum of consecutive naturals, for example, 23680104 + ... + 23680193.

It is an arithmetic number, because the mean of its divisors is an integer number (307841937).

Almost surely, 2^2131213365 is an apocalyptic number.

It is an amenable number.

2131213365 is a deficient number, since it is larger than the sum of its proper divisors (1562889879).

2131213365 is a wasteful number, since it uses less digits than its factorization.

2131213365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47360308 (or 47360305 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 2131213365 is about 46165.0665005478. The cubic root of 2131213365 is about 1286.8926200386.

Adding to 2131213365 its reverse (5633121312), we get a palindrome (7764334677).

It can be divided in two parts, 2131 and 213365, that added together give a triangular number (215496 = T₆₅₆).

The spelling of 2131213365 in words is "two billion, one hundred thirty-one million, two hundred thirteen thousand, three hundred sixty-five".