117701721 has 16 divisors (see below), whose sum is σ = 174772800. Its totient is φ = 78287904.

The previous prime is 117701657. The next prime is 117701723. The reversal of 117701721 is 127107711.

It is not a de Polignac number, because 117701721 - 2⁶ = 117701657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (117701723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7570 + ... + 17108.

It is an arithmetic number, because the mean of its divisors is an integer number (10923300).

Almost surely, 2^117701721 is an apocalyptic number.

It is an amenable number.

117701721 is a deficient number, since it is larger than the sum of its proper divisors (57071079).

117701721 is an equidigital number, since it uses as much as digits as its factorization.

117701721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10005 (or 9999 counting only the distinct ones).

The product of its (nonzero) digits is 686, while the sum is 27.

The square root of 117701721 is about 10849.0424001384. The cubic root of 117701721 is about 490.0731821836.

The spelling of 117701721 in words is "one hundred seventeen million, seven hundred one thousand, seven hundred twenty-one".