220695121 has 8 divisors (see below), whose sum is σ = 226877480. Its totient is φ = 214681104.

The previous prime is 220695109. The next prime is 220695131. The reversal of 220695121 is 121596022.

It can be written as a sum of positive squares in 4 ways, for example, as 167987521 + 52707600 = 12961^2 + 7260^2 .

It is not a de Polignac number, because 220695121 - 2¹⁹ = 220170833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220695121.

It is not an unprimeable number, because it can be changed into a prime (220695131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48475 + ... + 52831.

It is an arithmetic number, because the mean of its divisors is an integer number (28359685).

Almost surely, 2^220695121 is an apocalyptic number.

It is an amenable number.

220695121 is a deficient number, since it is larger than the sum of its proper divisors (6182359).

220695121 is an frugal number, since it uses more digits than its factorization.

220695121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4468 (or 4394 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 220695121 is about 14855.8110179148. The cubic root of 220695121 is about 604.3162103529.

Subtracting from 220695121 its reverse (121596022), we obtain a palindrome (99099099).

The spelling of 220695121 in words is "two hundred twenty million, six hundred ninety-five thousand, one hundred twenty-one".