1126331221 has 4 divisors (see below), whose sum is σ = 1126502892. Its totient is φ = 1126159552.

The previous prime is 1126331201. The next prime is 1126331257. The reversal of 1126331221 is 1221336211.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 759608721 + 366722500 = 27561^2 + 19150^2 .

It is a cyclic number.

It is not a de Polignac number, because 1126331221 - 2²⁹ = 589460309 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1126331192 and 1126331201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1126331201) 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, 75586 + ... + 89251.

It is an arithmetic number, because the mean of its divisors is an integer number (281625723).

Almost surely, 2^1126331221 is an apocalyptic number.

It is an amenable number.

1126331221 is a deficient number, since it is larger than the sum of its proper divisors (171671).

1126331221 is an equidigital number, since it uses as much as digits as its factorization.

1126331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171670.

The product of its digits is 432, while the sum is 22.

The square root of 1126331221 is about 33560.8584663742. The cubic root of 1126331221 is about 1040.4519796402.

Adding to 1126331221 its reverse (1221336211), we get a palindrome (2347667432).

The spelling of 1126331221 in words is "one billion, one hundred twenty-six million, three hundred thirty-one thousand, two hundred twenty-one".