16442621 has 16 divisors (see below), whose sum is σ = 19160064. Its totient is φ = 13972224.

The previous prime is 16442609. The next prime is 16442659. The reversal of 16442621 is 12624461.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16442621 is a prime.

It is a super-3 number, since 3×16442621³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16442521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9596 + ... + 11178.

It is an arithmetic number, because the mean of its divisors is an integer number (1197504).

Almost surely, 2^16442621 is an apocalyptic number.

It is an amenable number.

16442621 is a deficient number, since it is larger than the sum of its proper divisors (2717443).

16442621 is a wasteful number, since it uses less digits than its factorization.

16442621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660.

The product of its digits is 2304, while the sum is 26.

The square root of 16442621 is about 4054.9501846509. The cubic root of 16442621 is about 254.2867212944.

The spelling of 16442621 in words is "sixteen million, four hundred forty-two thousand, six hundred twenty-one".