2111233121 has 4 divisors (see below), whose sum is σ = 2111416512. Its totient is φ = 2111049732.

The previous prime is 2111233087. The next prime is 2111233123. The reversal of 2111233121 is 1213321112.

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 a de Polignac number, because none of the positive numbers 2^k-2111233121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2111233121.

It is not an unprimeable number, because it can be changed into a prime (2111233123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73181 + ... + 97866.

It is an arithmetic number, because the mean of its divisors is an integer number (527854128).

Almost surely, 2^2111233121 is an apocalyptic number.

It is an amenable number.

2111233121 is a deficient number, since it is larger than the sum of its proper divisors (183391).

2111233121 is a wasteful number, since it uses less digits than its factorization.

2111233121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183390.

The product of its digits is 72, while the sum is 17.

The square root of 2111233121 is about 45948.1568836009. The cubic root of 2111233121 is about 1282.8584233809.

Adding to 2111233121 its reverse (1213321112), we get a palindrome (3324554233).

The spelling of 2111233121 in words is "two billion, one hundred eleven million, two hundred thirty-three thousand, one hundred twenty-one".