117840021 has 32 divisors (see below), whose sum is σ = 180741120. Its totient is φ = 67737600.

The previous prime is 117840011. The next prime is 117840029. The reversal of 117840021 is 120048711.

It is not a de Polignac number, because 117840021 - 2⁷ = 117839893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 117839973 and 117840000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117840029) 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 in 31 ways as a sum of consecutive naturals, for example, 33381 + ... + 36741.

It is an arithmetic number, because the mean of its divisors is an integer number (5648160).

Almost surely, 2^117840021 is an apocalyptic number.

It is an amenable number.

117840021 is a deficient number, since it is larger than the sum of its proper divisors (62901099).

117840021 is a wasteful number, since it uses less digits than its factorization.

117840021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3437.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 117840021 is about 10855.4143633488. The cubic root of 117840021 is about 490.2650530464.

Adding to 117840021 its reverse (120048711), we get a palindrome (237888732).

The spelling of 117840021 in words is "one hundred seventeen million, eight hundred forty thousand, twenty-one".