16428621 has 16 divisors (see below), whose sum is σ = 24007680. Its totient is φ = 9910320.

The previous prime is 16428611. The next prime is 16428653. The reversal of 16428621 is 12682461.

It is not a de Polignac number, because 16428621 - 2⁶ = 16428557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16428611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6846 + ... + 8928.

It is an arithmetic number, because the mean of its divisors is an integer number (1500480).

Almost surely, 2^16428621 is an apocalyptic number.

16428621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16428621 is a deficient number, since it is larger than the sum of its proper divisors (7579059).

16428621 is a wasteful number, since it uses less digits than its factorization.

16428621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2336.

The product of its digits is 4608, while the sum is 30.

The square root of 16428621 is about 4053.2235319558. The cubic root of 16428621 is about 254.2145303511.

The spelling of 16428621 in words is "sixteen million, four hundred twenty-eight thousand, six hundred twenty-one".