16162221 has 8 divisors (see below), whose sum is σ = 21568384. Its totient is φ = 10765440.

The previous prime is 16162187. The next prime is 16162231. The reversal of 16162221 is 12226161.

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

It is not a de Polignac number, because 16162221 - 2¹⁷ = 16031149 is a prime.

It is a super-2 number, since 2×16162221² = 522434775305682, 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 (16162231) 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, 4716 + ... + 7386.

It is an arithmetic number, because the mean of its divisors is an integer number (2696048).

Almost surely, 2^16162221 is an apocalyptic number.

It is an amenable number.

16162221 is a deficient number, since it is larger than the sum of its proper divisors (5406163).

16162221 is a wasteful number, since it uses less digits than its factorization.

16162221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4691.

The product of its digits is 288, while the sum is 21.

The square root of 16162221 is about 4020.2264861572. The cubic root of 16162221 is about 252.8329548734.

Adding to 16162221 its reverse (12226161), we get a palindrome (28388382).

The spelling of 16162221 in words is "sixteen million, one hundred sixty-two thousand, two hundred twenty-one".