16603045221 has 16 divisors (see below), whose sum is σ = 25356240000. Its totient is φ = 9466318848.

The previous prime is 16603045181. The next prime is 16603045231. The reversal of 16603045221 is 12254030661.

It is not a de Polignac number, because 16603045221 - 2¹⁰ = 16603044197 is a prime.

It is a super-2 number, since 2×16603045221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16603045231) 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, 870996 + ... + 889853.

It is an arithmetic number, because the mean of its divisors is an integer number (1584765000).

Almost surely, 2^16603045221 is an apocalyptic number.

It is an amenable number.

16603045221 is a deficient number, since it is larger than the sum of its proper divisors (8753194779).

16603045221 is a wasteful number, since it uses less digits than its factorization.

16603045221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761308.

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 16603045221 its reverse (12254030661), we get a palindrome (28857075882).

The spelling of 16603045221 in words is "sixteen billion, six hundred three million, forty-five thousand, two hundred twenty-one".