2113513221 has 4 divisors (see below), whose sum is σ = 2818017632. Its totient is φ = 1409008812.

The previous prime is 2113513187. The next prime is 2113513231. The reversal of 2113513221 is 1223153112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2113513221 - 2⁷ = 2113513093 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 (2113513231) 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 3 ways as a sum of consecutive naturals, for example, 352252201 + ... + 352252206.

It is an arithmetic number, because the mean of its divisors is an integer number (704504408).

Almost surely, 2^2113513221 is an apocalyptic number.

It is an amenable number.

2113513221 is a deficient number, since it is larger than the sum of its proper divisors (704504411).

2113513221 is an equidigital number, since it uses as much as digits as its factorization.

2113513221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704504410.

The product of its digits is 360, while the sum is 21.

The square root of 2113513221 is about 45972.9618471553. The cubic root of 2113513221 is about 1283.3200798241.

Adding to 2113513221 its reverse (1223153112), we get a palindrome (3336666333).

The spelling of 2113513221 in words is "two billion, one hundred thirteen million, five hundred thirteen thousand, two hundred twenty-one".