1121212320 has 96 divisors (see below), whose sum is σ = 3536447040. Its totient is φ = 298598400.

The previous prime is 1121212277. The next prime is 1121212321. The reversal of 1121212320 is 232121211.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1121212320.

It is not an unprimeable number, because it can be changed into a prime (1121212321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 699520 + ... + 701120.

It is an arithmetic number, because the mean of its divisors is an integer number (36837990).

Almost surely, 2^1121212320 is an apocalyptic number.

1121212320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1121212320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1768223520).

1121212320 is an abundant number, since it is smaller than the sum of its proper divisors (2415234720).

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

1121212320 is a wasteful number, since it uses less digits than its factorization.

1121212320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3078 (or 3070 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1121212320 is about 33484.5086569894. The cubic root of 1121212320 is about 1038.8733855209.

Adding to 1121212320 its reverse (232121211), we get a palindrome (1353333531).

It can be divided in two parts, 11212 and 12320, that added together give a palindrome (23532).

The spelling of 1121212320 in words is "one billion, one hundred twenty-one million, two hundred twelve thousand, three hundred twenty".