220494121 has 4 divisors (see below), whose sum is σ = 223599744. Its totient is φ = 217388500.

The previous prime is 220494083. The next prime is 220494167. The reversal of 220494121 is 121494022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220494121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220494181) 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 3 ways as a sum of consecutive naturals, for example, 1552705 + ... + 1552846.

It is an arithmetic number, because the mean of its divisors is an integer number (55899936).

Almost surely, 2^220494121 is an apocalyptic number.

It is an amenable number.

220494121 is a deficient number, since it is larger than the sum of its proper divisors (3105623).

220494121 is an equidigital number, since it uses as much as digits as its factorization.

220494121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3105622.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 220494121 is about 14849.0444473710. The cubic root of 220494121 is about 604.1326925475.

Subtracting from 220494121 its reverse (121494022), we obtain a palindrome (99000099).

The spelling of 220494121 in words is "two hundred twenty million, four hundred ninety-four thousand, one hundred twenty-one".