1131032221 has 8 divisors (see below), whose sum is σ = 1240056000. Its totient is φ = 1023042240.

The previous prime is 1131032213. The next prime is 1131032237. The reversal of 1131032221 is 1222301311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1131032221 - 2³ = 1131032213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1131032195 and 1131032204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131032251) 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, 256156 + ... + 260533.

It is an arithmetic number, because the mean of its divisors is an integer number (155007000).

Almost surely, 2^1131032221 is an apocalyptic number.

1131032221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1131032221 is a deficient number, since it is larger than the sum of its proper divisors (109023779).

1131032221 is a wasteful number, since it uses less digits than its factorization.

1131032221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516899.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1131032221 is about 33630.8224847386. The cubic root of 1131032221 is about 1041.8974915829.

Adding to 1131032221 its reverse (1222301311), we get a palindrome (2353333532).

The spelling of 1131032221 in words is "one billion, one hundred thirty-one million, thirty-two thousand, two hundred twenty-one".