221621122 has 8 divisors (see below), whose sum is σ = 336437136. Its totient is φ = 109475412.

The previous prime is 221621119. The next prime is 221621177. The reversal of 221621122 is 221126122.

221621122 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 221621122.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 667368 + ... + 667699.

It is an arithmetic number, because the mean of its divisors is an integer number (42054642).

Almost surely, 2^221621122 is an apocalyptic number.

221621122 is a deficient number, since it is larger than the sum of its proper divisors (114816014).

221621122 is a wasteful number, since it uses less digits than its factorization.

221621122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335152.

The product of its digits is 192, while the sum is 19.

The square root of 221621122 is about 14886.9446831779. The cubic root of 221621122 is about 605.1602353165.

Adding to 221621122 its reverse (221126122), we get a palindrome (442747244).

The spelling of 221621122 in words is "two hundred twenty-one million, six hundred twenty-one thousand, one hundred twenty-two".