16721134 has 8 divisors (see below), whose sum is σ = 25212240. Its totient is φ = 8317056.

The previous prime is 16721119. The next prime is 16721141. The reversal of 16721134 is 43112761.

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

It is a junction number, because it is equal to n+sod(n) for n = 16721099 and 16721108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21274 + ... + 22045.

It is an arithmetic number, because the mean of its divisors is an integer number (3151530).

Almost surely, 2^16721134 is an apocalyptic number.

16721134 is a deficient number, since it is larger than the sum of its proper divisors (8491106).

16721134 is a wasteful number, since it uses less digits than its factorization.

16721134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43514.

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

The square root of 16721134 is about 4089.1483220837. The cubic root of 16721134 is about 255.7144337686.

Adding to 16721134 its reverse (43112761), we get a palindrome (59833895).

The spelling of 16721134 in words is "sixteen million, seven hundred twenty-one thousand, one hundred thirty-four".