1171270221 has 16 divisors (see below), whose sum is σ = 1739916288. Its totient is φ = 694756400.

The previous prime is 1171270201. The next prime is 1171270273. The reversal of 1171270221 is 1220721711.

It is a cyclic number.

It is not a de Polignac number, because 1171270221 - 2⁶ = 1171270157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1171270191 and 1171270200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1171270201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 376035 + ... + 379136.

It is an arithmetic number, because the mean of its divisors is an integer number (108744768).

Almost surely, 2^1171270221 is an apocalyptic number.

1171270221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1171270221 is a deficient number, since it is larger than the sum of its proper divisors (568646067).

1171270221 is a wasteful number, since it uses less digits than its factorization.

1171270221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755232.

The product of its (nonzero) digits is 392, while the sum is 24.

The square root of 1171270221 is about 34223.8253414197. The cubic root of 1171270221 is about 1054.1094349559.

Adding to 1171270221 its reverse (1220721711), we get a palindrome (2391991932).

The spelling of 1171270221 in words is "one billion, one hundred seventy-one million, two hundred seventy thousand, two hundred twenty-one".