16721101 has 4 divisors (see below), whose sum is σ = 16765600. Its totient is φ = 16676604.

The previous prime is 16721093. The next prime is 16721119. The reversal of 16721101 is 10112761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16721101 - 2³ = 16721093 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 (16721141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21681 + ... + 22438.

It is an arithmetic number, because the mean of its divisors is an integer number (4191400).

Almost surely, 2^16721101 is an apocalyptic number.

It is an amenable number.

16721101 is a deficient number, since it is larger than the sum of its proper divisors (44499).

16721101 is an equidigital number, since it uses as much as digits as its factorization.

16721101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44498.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 16721101 is about 4089.1442870116. The cubic root of 16721101 is about 255.7142655467.

Adding to 16721101 its reverse (10112761), we get a palindrome (26833862).

The spelling of 16721101 in words is "sixteen million, seven hundred twenty-one thousand, one hundred one".