16421143 has 4 divisors (see below), whose sum is σ = 16439328. Its totient is φ = 16402960.

The previous prime is 16421129. The next prime is 16421147. The reversal of 16421143 is 34112461.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16421143 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 (16421147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7663 + ... + 9568.

It is an arithmetic number, because the mean of its divisors is an integer number (4109832).

Almost surely, 2^16421143 is an apocalyptic number.

16421143 is a deficient number, since it is larger than the sum of its proper divisors (18185).

16421143 is an equidigital number, since it uses as much as digits as its factorization.

16421143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18184.

The product of its digits is 576, while the sum is 22.

The square root of 16421143 is about 4052.3009513115. The cubic root of 16421143 is about 254.1759532693.

The spelling of 16421143 in words is "sixteen million, four hundred twenty-one thousand, one hundred forty-three".