117231721 has 4 divisors (see below), whose sum is σ = 118882944. Its totient is φ = 115580500.

The previous prime is 117231701. The next prime is 117231733. The reversal of 117231721 is 127132711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127132711 = 8053 ⋅15787.

It is a cyclic number.

It is not a de Polignac number, because 117231721 - 2⁵ = 117231689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117231701) 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, 825505 + ... + 825646.

It is an arithmetic number, because the mean of its divisors is an integer number (29720736).

Almost surely, 2^117231721 is an apocalyptic number.

It is an amenable number.

117231721 is a deficient number, since it is larger than the sum of its proper divisors (1651223).

117231721 is an equidigital number, since it uses as much as digits as its factorization.

117231721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651222.

The product of its digits is 588, while the sum is 25.

The square root of 117231721 is about 10827.3598351583. The cubic root of 117231721 is about 489.4200009562.

The spelling of 117231721 in words is "one hundred seventeen million, two hundred thirty-one thousand, seven hundred twenty-one".