16134721 has 8 divisors (see below), whose sum is σ = 16416000. Its totient is φ = 15855840.

The previous prime is 16134697. The next prime is 16134749. The reversal of 16134721 is 12743161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16134721 - 2⁷ = 16134593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16138721) 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 7 ways as a sum of consecutive naturals, for example, 17256 + ... + 18166.

It is an arithmetic number, because the mean of its divisors is an integer number (2052000).

Almost surely, 2^16134721 is an apocalyptic number.

It is an amenable number.

16134721 is a deficient number, since it is larger than the sum of its proper divisors (281279).

16134721 is an equidigital number, since it uses as much as digits as its factorization.

16134721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199.

The product of its digits is 1008, while the sum is 25.

The square root of 16134721 is about 4016.8048247332. The cubic root of 16134721 is about 252.6894751407.

Adding to 16134721 its reverse (12743161), we get a palindrome (28877882).

The spelling of 16134721 in words is "sixteen million, one hundred thirty-four thousand, seven hundred twenty-one".