671117021 has 2 divisors, whose sum is σ = 671117022. Its totient is φ = 671117020.

The previous prime is 671116991. The next prime is 671117093. The reversal of 671117021 is 120711176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 642064921 + 29052100 = 25339^2 + 5390^2 .

It is a cyclic number.

It is not a de Polignac number, because 671117021 - 2¹⁴ = 671100637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671117521) 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 as a sum of consecutive naturals, namely, 335558510 + 335558511.

It is an arithmetic number, because the mean of its divisors is an integer number (335558511).

Almost surely, 2^671117021 is an apocalyptic number.

It is an amenable number.

671117021 is a deficient number, since it is larger than the sum of its proper divisors (1).

671117021 is an equidigital number, since it uses as much as digits as its factorization.

671117021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 588, while the sum is 26.

The square root of 671117021 is about 25905.9263683042. The cubic root of 671117021 is about 875.5200265521.

Adding to 671117021 its reverse (120711176), we get a palindrome (791828197).

It can be divided in two parts, 6711 and 17021, that added together give a palindrome (23732).

The spelling of 671117021 in words is "six hundred seventy-one million, one hundred seventeen thousand, twenty-one".