1171317021 has 24 divisors (see below), whose sum is σ = 1895730624. Its totient is φ = 640221120.

The previous prime is 1171316977. The next prime is 1171317071. The reversal of 1171317021 is 1207131711.

It is not a de Polignac number, because 1171317021 - 2⁶ = 1171316957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1171316982 and 1171317000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1171317071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 169840 + ... + 176601.

It is an arithmetic number, because the mean of its divisors is an integer number (78988776).

Almost surely, 2^1171317021 is an apocalyptic number.

It is an amenable number.

1171317021 is a deficient number, since it is larger than the sum of its proper divisors (724413603).

1171317021 is a wasteful number, since it uses less digits than its factorization.

1171317021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346481 (or 346474 counting only the distinct ones).

The product of its (nonzero) digits is 294, while the sum is 24.

The square root of 1171317021 is about 34224.5090687945. The cubic root of 1171317021 is about 1054.1234743193.

Adding to 1171317021 its reverse (1207131711), we get a palindrome (2378448732).

The spelling of 1171317021 in words is "one billion, one hundred seventy-one million, three hundred seventeen thousand, twenty-one".