221422128 has 40 divisors (see below), whose sum is σ = 582806448. Its totient is φ = 72413952.

The previous prime is 221422111. The next prime is 221422129. The reversal of 221422128 is 821224122.

221422128 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 221422098 and 221422107.

It is not an unprimeable number, because it can be changed into a prime (221422129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40975 + ... + 46062.

Almost surely, 2^221422128 is an apocalyptic number.

It is an amenable number.

221422128 is an abundant number, since it is smaller than the sum of its proper divisors (361384320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221422128 is a wasteful number, since it uses less digits than its factorization.

221422128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87101 (or 87095 counting only the distinct ones).

The product of its digits is 1024, while the sum is 24.

The square root of 221422128 is about 14880.2596751535. The cubic root of 221422128 is about 604.9790562611.

It can be divided in two parts, 2214 and 22128, that added together give a palindrome (24342).

The spelling of 221422128 in words is "two hundred twenty-one million, four hundred twenty-two thousand, one hundred twenty-eight".