2111021243 has 4 divisors (see below), whose sum is σ = 2162509608. Its totient is φ = 2059532880.

The previous prime is 2111021221. The next prime is 2111021279. The reversal of 2111021243 is 3421201112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2111021243 - 2¹² = 2111017147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2111021743) 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, 25744121 + ... + 25744202.

It is an arithmetic number, because the mean of its divisors is an integer number (540627402).

Almost surely, 2^2111021243 is an apocalyptic number.

2111021243 is a deficient number, since it is larger than the sum of its proper divisors (51488365).

2111021243 is an equidigital number, since it uses as much as digits as its factorization.

2111021243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51488364.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 2111021243 is about 45945.8512055224. The cubic root of 2111021243 is about 1282.8155071395.

Adding to 2111021243 its reverse (3421201112), we get a palindrome (5532222355).

The spelling of 2111021243 in words is "two billion, one hundred eleven million, twenty-one thousand, two hundred forty-three".