2121111243 has 12 divisors (see below), whose sum is σ = 3169476960. Its totient is φ = 1365312816.

The previous prime is 2121111241. The next prime is 2121111253. The reversal of 2121111243 is 3421111212.

It is not a de Polignac number, because 2121111243 - 2¹ = 2121111241 is a prime.

It is a super-2 number, since 2×2121111243² = 8998225810362010098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2121111241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4063171 + ... + 4063692.

It is an arithmetic number, because the mean of its divisors is an integer number (264123080).

Almost surely, 2^2121111243 is an apocalyptic number.

2121111243 is a deficient number, since it is larger than the sum of its proper divisors (1048365717).

2121111243 is a wasteful number, since it uses less digits than its factorization.

2121111243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8126898 (or 8126895 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 2121111243 is about 46055.5234798173. The cubic root of 2121111243 is about 1284.8560741567.

Adding to 2121111243 its reverse (3421111212), we get a palindrome (5542222455).

The spelling of 2121111243 in words is "two billion, one hundred twenty-one million, one hundred eleven thousand, two hundred forty-three".