2113221231 has 80 divisors (see below), whose sum is σ = 3564950400. Its totient is φ = 1236513600.

The previous prime is 2113221203. The next prime is 2113221239. The reversal of 2113221231 is 1321223112.

2113221231 is a `hidden beast` number, since 211 + 3 + 221 + 231 = 666.

It is not a de Polignac number, because 2113221231 - 2⁹ = 2113220719 is a prime.

It is a super-2 number, since 2×2113221231² = 8931407942298310722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113221239) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3206380 + ... + 3207038.

It is an arithmetic number, because the mean of its divisors is an integer number (44561880).

Almost surely, 2^2113221231 is an apocalyptic number.

2113221231 is a deficient number, since it is larger than the sum of its proper divisors (1451729169).

2113221231 is a wasteful number, since it uses less digits than its factorization.

2113221231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802 (or 793 counting only the distinct ones).

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

The square root of 2113221231 is about 45969.7860665024. The cubic root of 2113221231 is about 1283.2609785634.

Adding to 2113221231 its reverse (1321223112), we get a palindrome (3434444343).

The spelling of 2113221231 in words is "two billion, one hundred thirteen million, two hundred twenty-one thousand, two hundred thirty-one".