1131021320 has 128 divisors (see below), whose sum is σ = 3120042240. Its totient is φ = 363095040.

The previous prime is 1131021319. The next prime is 1131021323. The reversal of 1131021320 is 231201311.

It is a junction number, because it is equal to n+sod(n) for n = 1131021295 and 1131021304.

It is not an unprimeable number, because it can be changed into a prime (1131021323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127262 + ... + 135858.

It is an arithmetic number, because the mean of its divisors is an integer number (24375330).

Almost surely, 2^1131021320 is an apocalyptic number.

1131021320 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 1131021320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1560021120).

1131021320 is an abundant number, since it is smaller than the sum of its proper divisors (1989020920).

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

1131021320 is a wasteful number, since it uses less digits than its factorization.

1131021320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8655 (or 8651 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1131021320 is about 33630.6604157575. The cubic root of 1131021320 is about 1041.8941442686.

Adding to 1131021320 its reverse (231201311), we get a palindrome (1362222631).

Subtracting from 1131021320 its reverse (231201311), we obtain a square (899820009 = 29997²).

The spelling of 1131021320 in words is "one billion, one hundred thirty-one million, twenty-one thousand, three hundred twenty".