1121220320 has 96 divisors (see below), whose sum is σ = 2897034336. Its totient is φ = 406681600.

The previous prime is 1121220311. The next prime is 1121220323. The reversal of 1121220320 is 230221211.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1121220295 and 1121220304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121220323) 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, 1191050 + ... + 1191990.

It is an arithmetic number, because the mean of its divisors is an integer number (30177441).

Almost surely, 2^1121220320 is an apocalyptic number.

1121220320 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 1121220320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1448517168).

1121220320 is an abundant number, since it is smaller than the sum of its proper divisors (1775814016).

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

1121220320 is a wasteful number, since it uses less digits than its factorization.

1121220320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644 (or 1636 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1121220320 is about 33484.6281150023. The cubic root of 1121220320 is about 1038.8758563486.

Adding to 1121220320 its reverse (230221211), we get a palindrome (1351441531).

The spelling of 1121220320 in words is "one billion, one hundred twenty-one million, two hundred twenty thousand, three hundred twenty".