1220331121 has 4 divisors (see below), whose sum is σ = 1220709744. Its totient is φ = 1219952500.

The previous prime is 1220331097. The next prime is 1220331137. The reversal of 1220331121 is 1211330221.

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-1220331121 is a prime.

It is a super-2 number, since 2×1220331121² = 2978416089762233282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220331095 and 1220331104.

It is not an unprimeable number, because it can be changed into a prime (1220331181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184435 + ... + 190936.

It is an arithmetic number, because the mean of its divisors is an integer number (305177436).

Almost surely, 2^1220331121 is an apocalyptic number.

It is an amenable number.

1220331121 is a deficient number, since it is larger than the sum of its proper divisors (378623).

1220331121 is an equidigital number, since it uses as much as digits as its factorization.

1220331121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378622.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1220331121 is about 34933.2380548955. The cubic root of 1220331121 is about 1068.6263915227.

Adding to 1220331121 its reverse (1211330221), we get a palindrome (2431661342).

The spelling of 1220331121 in words is "one billion, two hundred twenty million, three hundred thirty-one thousand, one hundred twenty-one".