220404121 has 4 divisors (see below), whose sum is σ = 251890432. Its totient is φ = 188917812.

The previous prime is 220404113. The next prime is 220404131. The reversal of 220404121 is 121404022.

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 not a de Polignac number, because 220404121 - 2³ = 220404113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220404095 and 220404104.

It is not an unprimeable number, because it can be changed into a prime (220404131) 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, 15743145 + ... + 15743158.

It is an arithmetic number, because the mean of its divisors is an integer number (62972608).

Almost surely, 2^220404121 is an apocalyptic number.

It is an amenable number.

220404121 is a deficient number, since it is larger than the sum of its proper divisors (31486311).

220404121 is an equidigital number, since it uses as much as digits as its factorization.

220404121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31486310.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 220404121 is about 14846.0136400315. The cubic root of 220404121 is about 604.0504842457.

Adding to 220404121 its reverse (121404022), we get a palindrome (341808143).

Subtracting from 220404121 its reverse (121404022), we obtain a palindrome (99000099).

The spelling of 220404121 in words is "two hundred twenty million, four hundred four thousand, one hundred twenty-one".