117305021 has 4 divisors (see below), whose sum is σ = 117817500. Its totient is φ = 116792544.

The previous prime is 117305009. The next prime is 117305033. The reversal of 117305021 is 120503711.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (117305009) and next prime (117305033).

It can be written as a sum of positive squares in 2 ways, for example, as 113656921 + 3648100 = 10661^2 + 1910^2 .

It is a cyclic number.

It is not a de Polignac number, because 117305021 - 2¹⁰ = 117303997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 117304984 and 117305002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117305051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255896 + ... + 256353.

It is an arithmetic number, because the mean of its divisors is an integer number (29454375).

Almost surely, 2^117305021 is an apocalyptic number.

It is an amenable number.

117305021 is a deficient number, since it is larger than the sum of its proper divisors (512479).

117305021 is an equidigital number, since it uses as much as digits as its factorization.

117305021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512478.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 117305021 is about 10830.7442495888. The cubic root of 117305021 is about 489.5219841948.

Adding to 117305021 its reverse (120503711), we get a palindrome (237808732).

The spelling of 117305021 in words is "one hundred seventeen million, three hundred five thousand, twenty-one".