16503213 has 12 divisors (see below), whose sum is σ = 23004800. Its totient is φ = 10522776.

The previous prime is 16503211. The next prime is 16503241. The reversal of 16503213 is 31230561.

It is not a de Polignac number, because 16503213 - 2¹ = 16503211 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16503213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16503211) 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, 3613 + ... + 6786.

Almost surely, 2^16503213 is an apocalyptic number.

It is an amenable number.

16503213 is a deficient number, since it is larger than the sum of its proper divisors (6501587).

16503213 is a wasteful number, since it uses less digits than its factorization.

16503213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10448 (or 10425 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 16503213 is about 4062.4146760271. The cubic root of 16503213 is about 254.5986921076.

Adding to 16503213 its reverse (31230561), we get a palindrome (47733774).

The spelling of 16503213 in words is "sixteen million, five hundred three thousand, two hundred thirteen".