220312121 has 4 divisors (see below), whose sum is σ = 220431744. Its totient is φ = 220192500.

The previous prime is 220312109. The next prime is 220312187. The reversal of 220312121 is 121213022.

It is a happy number.

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 220312121 - 2¹⁰ = 220311097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 220312096 and 220312105.

It is not an unprimeable number, because it can be changed into a prime (220312621) 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, 57005 + ... + 60746.

It is an arithmetic number, because the mean of its divisors is an integer number (55107936).

Almost surely, 2^220312121 is an apocalyptic number.

It is an amenable number.

220312121 is a deficient number, since it is larger than the sum of its proper divisors (119623).

220312121 is a wasteful number, since it uses less digits than its factorization.

220312121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119622.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 220312121 is about 14842.9148417688. The cubic root of 220312121 is about 603.9664259586.

Adding to 220312121 its reverse (121213022), we get a palindrome (341525143).

Subtracting from 220312121 its reverse (121213022), we obtain a palindrome (99099099).

The spelling of 220312121 in words is "two hundred twenty million, three hundred twelve thousand, one hundred twenty-one".