100721911 has 4 divisors (see below), whose sum is σ = 101935512. Its totient is φ = 99508312.

The previous prime is 100721897. The next prime is 100721917. The reversal of 100721911 is 119127001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 100721911 - 2⁵ = 100721879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100721917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 606676 + ... + 606841.

It is an arithmetic number, because the mean of its divisors is an integer number (25483878).

Almost surely, 2^100721911 is an apocalyptic number.

100721911 is a deficient number, since it is larger than the sum of its proper divisors (1213601).

100721911 is an equidigital number, since it uses as much as digits as its factorization.

100721911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213600.

The product of its (nonzero) digits is 126, while the sum is 22.

The square root of 100721911 is about 10036.0306396503. The cubic root of 100721911 is about 465.2731443353.

Adding to 100721911 its reverse (119127001), we get a palindrome (219848912).

The spelling of 100721911 in words is "one hundred million, seven hundred twenty-one thousand, nine hundred eleven".