1131141221 has 4 divisors (see below), whose sum is σ = 1292732832. Its totient is φ = 969549612.

The previous prime is 1131141217. The next prime is 1131141229. The reversal of 1131141221 is 1221411311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1221411311 = 17977 ⋅67943.

It is a cyclic number.

It is not a de Polignac number, because 1131141221 - 2² = 1131141217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1131141221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131141229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80795795 + ... + 80795808.

It is an arithmetic number, because the mean of its divisors is an integer number (323183208).

Almost surely, 2^1131141221 is an apocalyptic number.

It is an amenable number.

1131141221 is a deficient number, since it is larger than the sum of its proper divisors (161591611).

1131141221 is an equidigital number, since it uses as much as digits as its factorization.

1131141221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161591610.

The product of its digits is 48, while the sum is 17.

The square root of 1131141221 is about 33632.4429829294. The cubic root of 1131141221 is about 1041.9309604728.

Adding to 1131141221 its reverse (1221411311), we get a palindrome (2352552532).

The spelling of 1131141221 in words is "one billion, one hundred thirty-one million, one hundred forty-one thousand, two hundred twenty-one".