100721104 has 40 divisors (see below), whose sum is σ = 218655648. Its totient is φ = 44542080.

The previous prime is 100721099. The next prime is 100721113. The reversal of 100721104 is 401127001.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1222 + ... + 14245.

Almost surely, 2^100721104 is an apocalyptic number.

It is an amenable number.

100721104 is an abundant number, since it is smaller than the sum of its proper divisors (117934544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

100721104 is a wasteful number, since it uses less digits than its factorization.

100721104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15523 (or 15517 counting only the distinct ones).

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

The square root of 100721104 is about 10035.9904344315. The cubic root of 100721104 is about 465.2719017178.

Adding to 100721104 its reverse (401127001), we get a palindrome (501848105).

The spelling of 100721104 in words is "one hundred million, seven hundred twenty-one thousand, one hundred four".