16164421 has 16 divisors (see below), whose sum is σ = 20944000. Its totient is φ = 12115008.

The previous prime is 16164409. The next prime is 16164457. The reversal of 16164421 is 12446161.

It is not a de Polignac number, because 16164421 - 2⁵ = 16164389 is a prime.

It is a super-2 number, since 2×16164421² = 522577012530482, which contains 22 as substring.

It is the 4021-st Hogben number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16164461) by changing a digit.

It is a nontrivial repunit in base 4020.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2946 + ... + 6403.

It is an arithmetic number, because the mean of its divisors is an integer number (1309000).

Almost surely, 2^16164421 is an apocalyptic number.

It is an amenable number.

16164421 is a deficient number, since it is larger than the sum of its proper divisors (4779579).

16164421 is a wasteful number, since it uses less digits than its factorization.

16164421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9388.

The product of its digits is 1152, while the sum is 25.

The square root of 16164421 is about 4020.5000932720. The cubic root of 16164421 is about 252.8444262189.

The spelling of 16164421 in words is "sixteen million, one hundred sixty-four thousand, four hundred twenty-one".