117686021 has 2 divisors, whose sum is σ = 117686022. Its totient is φ = 117686020.

The previous prime is 117685993. The next prime is 117686047. The reversal of 117686021 is 120686711.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116856100 + 829921 = 10810^2 + 911^2 .

It is a cyclic number.

It is not a de Polignac number, because 117686021 - 2¹⁴ = 117669637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117686081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58843010 + 58843011.

It is an arithmetic number, because the mean of its divisors is an integer number (58843011).

Almost surely, 2^117686021 is an apocalyptic number.

It is an amenable number.

117686021 is a deficient number, since it is larger than the sum of its proper divisors (1).

117686021 is an equidigital number, since it uses as much as digits as its factorization.

117686021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 117686021 is about 10848.3188098433. The cubic root of 117686021 is about 490.0513912502.

The spelling of 117686021 in words is "one hundred seventeen million, six hundred eighty-six thousand, twenty-one".