1166341221 has 16 divisors (see below), whose sum is σ = 1751585920. Its totient is φ = 766908000.

The previous prime is 1166341207. The next prime is 1166341223. The reversal of 1166341221 is 1221436611.

It is a happy number.

1166341221 is a `hidden beast` number, since 1 + 1 + 6 + 634 + 1 + 2 + 21 = 666.

It is not a de Polignac number, because 1166341221 - 2²² = 1162146917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166341223) 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, 293905 + ... + 297846.

It is an arithmetic number, because the mean of its divisors is an integer number (109474120).

Almost surely, 2^1166341221 is an apocalyptic number.

It is an amenable number.

1166341221 is a deficient number, since it is larger than the sum of its proper divisors (585244699).

1166341221 is an equidigital number, since it uses as much as digits as its factorization.

1166341221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591833 (or 591827 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1166341221 is about 34151.7381841686. The cubic root of 1166341221 is about 1052.6287032746.

Adding to 1166341221 its reverse (1221436611), we get a palindrome (2387777832).

It can be divided in two parts, 116634 and 1221, that added together give a triangular number (117855 = T₄₈₅).

The spelling of 1166341221 in words is "one billion, one hundred sixty-six million, three hundred forty-one thousand, two hundred twenty-one".