2113220221 has 4 divisors (see below), whose sum is σ = 2415108832. Its totient is φ = 1811331612.

The previous prime is 2113220209. The next prime is 2113220231. The reversal of 2113220221 is 1220223112.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 2113220221 - 2⁷ = 2113220093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2113220195 and 2113220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113220231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150944295 + ... + 150944308.

It is an arithmetic number, because the mean of its divisors is an integer number (603777208).

Almost surely, 2^2113220221 is an apocalyptic number.

It is an amenable number.

2113220221 is a deficient number, since it is larger than the sum of its proper divisors (301888611).

2113220221 is an equidigital number, since it uses as much as digits as its factorization.

2113220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301888610.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2113220221 is about 45969.7750810247. The cubic root of 2113220221 is about 1283.2607741214.

Adding to 2113220221 its reverse (1220223112), we get a palindrome (3333443333).

The spelling of 2113220221 in words is "two billion, one hundred thirteen million, two hundred twenty thousand, two hundred twenty-one".