16421144 has 16 divisors (see below), whose sum is σ = 30847920. Its totient is φ = 8195040.

The previous prime is 16421129. The next prime is 16421147. The reversal of 16421144 is 44112461.

It is a happy 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3422 + ... + 6674.

It is an arithmetic number, because the mean of its divisors is an integer number (1927995).

Almost surely, 2^16421144 is an apocalyptic number.

It is an amenable number.

16421144 is a deficient number, since it is larger than the sum of its proper divisors (14426776).

16421144 is a wasteful number, since it uses less digits than its factorization.

16421144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3890 (or 3886 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 16421144 is about 4052.3010746982. The cubic root of 16421144 is about 254.1759584289.

The spelling of 16421144 in words is "sixteen million, four hundred twenty-one thousand, one hundred forty-four".