1211243112 has 64 divisors (see below), whose sum is σ = 3510864000. Its totient is φ = 386191872.

The previous prime is 1211243107. The next prime is 1211243119. The reversal of 1211243112 is 2113421121.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1211243119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116937 + ... + 126872.

It is an arithmetic number, because the mean of its divisors is an integer number (54857250).

Almost surely, 2^1211243112 is an apocalyptic number.

1211243112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211243112 is an abundant number, since it is smaller than the sum of its proper divisors (2299620888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211243112 is a wasteful number, since it uses less digits than its factorization.

1211243112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243847 (or 243837 counting only the distinct ones).

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

The square root of 1211243112 is about 34802.9181535112. The cubic root of 1211243112 is about 1065.9670327856.

Adding to 1211243112 its reverse (2113421121), we get a palindrome (3324664233).

The spelling of 1211243112 in words is "one billion, two hundred eleven million, two hundred forty-three thousand, one hundred twelve".