117910021 has 2 divisors, whose sum is σ = 117910022. Its totient is φ = 117910020.

The previous prime is 117910007. The next prime is 117910031. The reversal of 117910021 is 120019711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108368100 + 9541921 = 10410^2 + 3089^2 .

It is a cyclic number.

It is not a de Polignac number, because 117910021 - 2⁷ = 117909893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 117909974 and 117910001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117910031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58955010 + 58955011.

It is an arithmetic number, because the mean of its divisors is an integer number (58955011).

Almost surely, 2^117910021 is an apocalyptic number.

It is an amenable number.

117910021 is a deficient number, since it is larger than the sum of its proper divisors (1).

117910021 is an equidigital number, since it uses as much as digits as its factorization.

117910021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 22.

The square root of 117910021 is about 10858.6380821906. The cubic root of 117910021 is about 490.3621105098.

Adding to 117910021 its reverse (120019711), we get a palindrome (237929732).

The spelling of 117910021 in words is "one hundred seventeen million, nine hundred ten thousand, twenty-one".