2111321221 has 4 divisors (see below), whose sum is σ = 2112453952. Its totient is φ = 2110188492.

The previous prime is 2111321213. The next prime is 2111321243. The reversal of 2111321221 is 1221231112.

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 2111321221 - 2³ = 2111321213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111321195 and 2111321204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111321321) 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, 563565 + ... + 567298.

It is an arithmetic number, because the mean of its divisors is an integer number (528113488).

Almost surely, 2^2111321221 is an apocalyptic number.

It is an amenable number.

2111321221 is a deficient number, since it is larger than the sum of its proper divisors (1132731).

2111321221 is a wasteful number, since it uses less digits than its factorization.

2111321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132730.

The product of its digits is 48, while the sum is 16.

The square root of 2111321221 is about 45949.1155627614. The cubic root of 2111321221 is about 1282.8762673372.

Adding to 2111321221 its reverse (1221231112), we get a palindrome (3332552333).

The spelling of 2111321221 in words is "two billion, one hundred eleven million, three hundred twenty-one thousand, two hundred twenty-one".