100684721 has 8 divisors (see below), whose sum is σ = 102009600. Its totient is φ = 99364320.

The previous prime is 100684697. The next prime is 100684729. The reversal of 100684721 is 127486001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 100684721 - 2⁶ = 100684657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100684729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81176 + ... + 82406.

It is an arithmetic number, because the mean of its divisors is an integer number (12751200).

Almost surely, 2^100684721 is an apocalyptic number.

It is an amenable number.

100684721 is a deficient number, since it is larger than the sum of its proper divisors (1324879).

100684721 is an equidigital number, since it uses as much as digits as its factorization.

100684721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2239.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 100684721 is about 10034.1776444311. The cubic root of 100684721 is about 465.2158723270.

The spelling of 100684721 in words is "one hundred million, six hundred eighty-four thousand, seven hundred twenty-one".