16531003213 has 4 divisors (see below), whose sum is σ = 16842908988. Its totient is φ = 16219097440.

The previous prime is 16531003211. The next prime is 16531003243. The reversal of 16531003213 is 31230013561.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7437855049 + 9093148164 = 86243^2 + 95358^2 .

It is a cyclic number.

It is not a de Polignac number, because 16531003213 - 2¹ = 16531003211 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 (16531003211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155952808 + ... + 155952913.

It is an arithmetic number, because the mean of its divisors is an integer number (4210727247).

Almost surely, 2^16531003213 is an apocalyptic number.

It is an amenable number.

16531003213 is a deficient number, since it is larger than the sum of its proper divisors (311905775).

16531003213 is an equidigital number, since it uses as much as digits as its factorization.

16531003213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311905774.

The product of its (nonzero) digits is 1620, while the sum is 25.

Adding to 16531003213 its reverse (31230013561), we get a palindrome (47761016774).

The spelling of 16531003213 in words is "sixteen billion, five hundred thirty-one million, three thousand, two hundred thirteen".