220544121 has 8 divisors (see below), whose sum is σ = 336067264. Its totient is φ = 126025200.

The previous prime is 220544117. The next prime is 220544123. The reversal of 220544121 is 121445022.

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

It is not a de Polignac number, because 220544121 - 2² = 220544117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 10502101 = 220544121 / (2 + 2 + 0 + 5 + 4 + 4 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220544123) 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, 5251030 + ... + 5251071.

It is an arithmetic number, because the mean of its divisors is an integer number (42008408).

Almost surely, 2^220544121 is an apocalyptic number.

220544121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

220544121 is a deficient number, since it is larger than the sum of its proper divisors (115523143).

220544121 is a wasteful number, since it uses less digits than its factorization.

220544121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10502111.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 220544121 is about 14850.7279619553. The cubic root of 220544121 is about 604.1783541605.

Adding to 220544121 its reverse (121445022), we get a palindrome (341989143).

Subtracting from 220544121 its reverse (121445022), we obtain a palindrome (99099099).

The spelling of 220544121 in words is "two hundred twenty million, five hundred forty-four thousand, one hundred twenty-one".