2113231221 has 8 divisors (see below), whose sum is σ = 3130712960. Its totient is φ = 1408820796.

The previous prime is 2113231217. The next prime is 2113231231. The reversal of 2113231221 is 1221323112.

2113231221 is a `hidden beast` number, since 211 + 3 + 231 + 221 = 666.

It is not a de Polignac number, because 2113231221 - 2² = 2113231217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2113231194 and 2113231203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113231201) 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, 39133885 + ... + 39133938.

It is an arithmetic number, because the mean of its divisors is an integer number (391339120).

Almost surely, 2^2113231221 is an apocalyptic number.

It is an amenable number.

2113231221 is a deficient number, since it is larger than the sum of its proper divisors (1017481739).

2113231221 is an equidigital number, since it uses as much as digits as its factorization.

2113231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78267832 (or 78267826 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 2113231221 is about 45969.8947247000. The cubic root of 2113231221 is about 1283.2630007144.

Adding to 2113231221 its reverse (1221323112), we get a palindrome (3334554333).

The spelling of 2113231221 in words is "two billion, one hundred thirteen million, two hundred thirty-one thousand, two hundred twenty-one".