1212111243 has 16 divisors (see below), whose sum is σ = 2052252160. Its totient is φ = 692634888.

The previous prime is 1212111239. The next prime is 1212111317. The reversal of 1212111243 is 3421112121.

1212111243 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1212111243 - 2² = 1212111239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212111143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3206455 + ... + 3206832.

It is an arithmetic number, because the mean of its divisors is an integer number (128265760).

Almost surely, 2^1212111243 is an apocalyptic number.

1212111243 is a deficient number, since it is larger than the sum of its proper divisors (840140917).

1212111243 is an equidigital number, since it uses as much as digits as its factorization.

1212111243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6413303 (or 6413297 counting only the distinct ones).

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

The square root of 1212111243 is about 34815.3880202419. The cubic root of 1212111243 is about 1066.2216411899.

Adding to 1212111243 its reverse (3421112121), we get a palindrome (4633223364).

The spelling of 1212111243 in words is "one billion, two hundred twelve million, one hundred eleven thousand, two hundred forty-three".