16421128 has 16 divisors (see below), whose sum is σ = 30839760. Its totient is φ = 8197200.

The previous prime is 16421113. The next prime is 16421129. The reversal of 16421128 is 82112461.

It is not an unprimeable number, because it can be changed into a prime (16421129) 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, 5223 + ... + 7753.

It is an arithmetic number, because the mean of its divisors is an integer number (1927485).

Almost surely, 2^16421128 is an apocalyptic number.

It is an amenable number.

16421128 is a deficient number, since it is larger than the sum of its proper divisors (14418632).

16421128 is a wasteful number, since it uses less digits than its factorization.

16421128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3348 (or 3344 counting only the distinct ones).

The product of its digits is 768, while the sum is 25.

The square root of 16421128 is about 4052.2991005107. The cubic root of 16421128 is about 254.1758758764.

Adding to 16421128 its reverse (82112461), we get a palindrome (98533589).

The spelling of 16421128 in words is "sixteen million, four hundred twenty-one thousand, one hundred twenty-eight".