16381213 has 4 divisors (see below), whose sum is σ = 16434880. Its totient is φ = 16327548.

The previous prime is 16381207. The next prime is 16381231. The reversal of 16381213 is 31218361.

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 a de Polignac number, because none of the positive numbers 2^k-16381213 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 (16381513) 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, 26373 + ... + 26986.

It is an arithmetic number, because the mean of its divisors is an integer number (4108720).

Almost surely, 2^16381213 is an apocalyptic number.

It is an amenable number.

16381213 is a deficient number, since it is larger than the sum of its proper divisors (53667).

16381213 is an equidigital number, since it uses as much as digits as its factorization.

16381213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53666.

The product of its digits is 864, while the sum is 25.

The square root of 16381213 is about 4047.3711220989. The cubic root of 16381213 is about 253.9697661743.

Adding to 16381213 its reverse (31218361), we get a palindrome (47599574).

The spelling of 16381213 in words is "sixteen million, three hundred eighty-one thousand, two hundred thirteen".