1211113344 has 64 divisors (see below), whose sum is σ = 3676602240. Its totient is φ = 346031616.

The previous prime is 1211113339. The next prime is 1211113349. The reversal of 1211113344 is 4433111121.

It is an interprime number because it is at equal distance from previous prime (1211113339) and next prime (1211113349).

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (21).

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

It is a self number, because there is not a number n which added to its sum of digits gives 1211113344.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211113349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222594 + ... + 227969.

It is an arithmetic number, because the mean of its divisors is an integer number (57446910).

Almost surely, 2^1211113344 is an apocalyptic number.

1211113344 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1211113344 is an abundant number, since it is smaller than the sum of its proper divisors (2465488896).

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

1211113344 is an equidigital number, since it uses as much as digits as its factorization.

1211113344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450587 (or 450575 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

The square root of 1211113344 is about 34801.0537771488. The cubic root of 1211113344 is about 1065.9289635357.

Adding to 1211113344 its reverse (4433111121), we get a palindrome (5644224465).

The spelling of 1211113344 in words is "one billion, two hundred eleven million, one hundred thirteen thousand, three hundred forty-four".