2113031221 has 4 divisors (see below), whose sum is σ = 2414892832. Its totient is φ = 1811169612.

The previous prime is 2113031191. The next prime is 2113031231. The reversal of 2113031221 is 1221303112.

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 2113031221 - 2¹¹ = 2113029173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2113031195 and 2113031204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113031231) 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, 150930795 + ... + 150930808.

It is an arithmetic number, because the mean of its divisors is an integer number (603723208).

Almost surely, 2^2113031221 is an apocalyptic number.

It is an amenable number.

2113031221 is a deficient number, since it is larger than the sum of its proper divisors (301861611).

2113031221 is an equidigital number, since it uses as much as digits as its factorization.

2113031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301861610.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2113031221 is about 45967.7193365083. The cubic root of 2113031221 is about 1283.2225159984. Note that the first 3 decimals are identical.

Adding to 2113031221 its reverse (1221303112), we get a palindrome (3334334333).

The spelling of 2113031221 in words is "two billion, one hundred thirteen million, thirty-one thousand, two hundred twenty-one".