2221123111 has 4 divisors (see below), whose sum is σ = 2233531800. Its totient is φ = 2208714424.

The previous prime is 2221123109. The next prime is 2221123127. The reversal of 2221123111 is 1113211222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1113211222 = 2 ⋅556605611.

It is a cyclic number.

It is not a de Polignac number, because 2221123111 - 2¹ = 2221123109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221123811) 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, 6204076 + ... + 6204433.

It is an arithmetic number, because the mean of its divisors is an integer number (558382950).

Almost surely, 2^2221123111 is an apocalyptic number.

2221123111 is a deficient number, since it is larger than the sum of its proper divisors (12408689).

2221123111 is a wasteful number, since it uses less digits than its factorization.

2221123111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12408688.

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

The square root of 2221123111 is about 47128.7928022775. The cubic root of 2221123111 is about 1304.7407011619.

Adding to 2221123111 its reverse (1113211222), we get a palindrome (3334334333).

The spelling of 2221123111 in words is "two billion, two hundred twenty-one million, one hundred twenty-three thousand, one hundred eleven".