16164221 has 8 divisors (see below), whose sum is σ = 16409184. Its totient is φ = 15921360.

The previous prime is 16164217. The next prime is 16164233. The reversal of 16164221 is 12246161.

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 16164221 - 2² = 16164217 is a prime.

It is a super-2 number, since 2×16164221² = 522564081073682, which contains 22 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 (16164251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20975 + ... + 21731.

It is an arithmetic number, because the mean of its divisors is an integer number (2051148).

Almost surely, 2^16164221 is an apocalyptic number.

It is an amenable number.

16164221 is a deficient number, since it is larger than the sum of its proper divisors (244963).

16164221 is a wasteful number, since it uses less digits than its factorization.

16164221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051.

The product of its digits is 576, while the sum is 23.

The square root of 16164221 is about 4020.4752206673. The cubic root of 16164221 is about 252.8433834123.

The spelling of 16164221 in words is "sixteen million, one hundred sixty-four thousand, two hundred twenty-one".