2121532313 has 8 divisors (see below), whose sum is σ = 2136845256. Its totient is φ = 2106259200.

The previous prime is 2121532279. The next prime is 2121532321. The reversal of 2121532313 is 3132351212.

It can be written as a sum of positive squares in 4 ways, for example, as 21418384 + 2100113929 = 4628^2 + 45827^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2121532313 - 2⁸ = 2121532057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121592313) 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, 101393 + ... + 120513.

It is an arithmetic number, because the mean of its divisors is an integer number (267105657).

Almost surely, 2^2121532313 is an apocalyptic number.

It is an amenable number.

2121532313 is a deficient number, since it is larger than the sum of its proper divisors (15312943).

2121532313 is a wasteful number, since it uses less digits than its factorization.

2121532313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19915.

The product of its digits is 1080, while the sum is 23.

The square root of 2121532313 is about 46060.0945830553. The cubic root of 2121532313 is about 1284.9410891149.

Adding to 2121532313 its reverse (3132351212), we get a palindrome (5253883525).

The spelling of 2121532313 in words is "two billion, one hundred twenty-one million, five hundred thirty-two thousand, three hundred thirteen".