221620162 has 4 divisors (see below), whose sum is σ = 332430246. Its totient is φ = 110810080.

The previous prime is 221620141. The next prime is 221620171. The reversal of 221620162 is 261026122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 138791961 + 82828201 = 11781^2 + 9101^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55405039 + ... + 55405042.

Almost surely, 2^221620162 is an apocalyptic number.

221620162 is a deficient number, since it is larger than the sum of its proper divisors (110810084).

221620162 is a wasteful number, since it uses less digits than its factorization.

221620162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110810083.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 221620162 is about 14886.9124401267. The cubic root of 221620162 is about 605.1593615209.

Adding to 221620162 its reverse (261026122), we get a palindrome (482646284).

The spelling of 221620162 in words is "two hundred twenty-one million, six hundred twenty thousand, one hundred sixty-two".