16721103 has 12 divisors (see below), whose sum is σ = 25935000. Its totient is φ = 9554832.

The previous prime is 16721093. The next prime is 16721119. The reversal of 16721103 is 30112761.

It is not a de Polignac number, because 16721103 - 2⁴ = 16721087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 16721103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16722103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56728 + ... + 57021.

It is an arithmetic number, because the mean of its divisors is an integer number (2161250).

Almost surely, 2^16721103 is an apocalyptic number.

16721103 is a deficient number, since it is larger than the sum of its proper divisors (9213897).

16721103 is a wasteful number, since it uses less digits than its factorization.

16721103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113766 (or 113759 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 16721103 is about 4089.1445315616. The cubic root of 16721103 is about 255.7142757419.

Adding to 16721103 its reverse (30112761), we get a palindrome (46833864).

It can be divided in two parts, 1672 and 1103, that added together give a triangular number (2775 = T₇₄).

The spelling of 16721103 in words is "sixteen million, seven hundred twenty-one thousand, one hundred three".