100104721 has 16 divisors (see below), whose sum is σ = 110684880. Its totient is φ = 90132480.

The previous prime is 100104713. The next prime is 100104727. The reversal of 100104721 is 127401001.

It can be written as a sum of positive squares in 8 ways, for example, as 404496 + 99700225 = 636^2 + 9985^2 .

It is a cyclic number.

It is not a de Polignac number, because 100104721 - 2³ = 100104713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100104695 and 100104704.

It is not an unprimeable number, because it can be changed into a prime (100104727) 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, 37065 + ... + 39673.

It is an arithmetic number, because the mean of its divisors is an integer number (6917805).

Almost surely, 2^100104721 is an apocalyptic number.

It is an amenable number.

100104721 is a deficient number, since it is larger than the sum of its proper divisors (10580159).

100104721 is a wasteful number, since it uses less digits than its factorization.

100104721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2724.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 100104721 is about 10005.2346799063. The cubic root of 100104721 is about 464.3208507779.

Adding to 100104721 its reverse (127401001), we get a palindrome (227505722).

The spelling of 100104721 in words is "one hundred million, one hundred four thousand, seven hundred twenty-one".