1220441121421 has 4 divisors (see below), whose sum is σ = 1234153943100. Its totient is φ = 1206728299744.

The previous prime is 1220441121377. The next prime is 1220441121433. The reversal of 1220441121421 is 1241211440221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 865774420900 + 354666700521 = 930470^2 + 595539^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220441121421 - 2⁷ = 1220441121293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220441121121) 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, 6856410706 + ... + 6856410883.

It is an arithmetic number, because the mean of its divisors is an integer number (308538485775).

Almost surely, 2^{1220441121421} is an apocalyptic number.

It is an amenable number.

1220441121421 is a deficient number, since it is larger than the sum of its proper divisors (13712821679).

1220441121421 is an equidigital number, since it uses as much as digits as its factorization.

1220441121421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13712821678.

The product of its (nonzero) digits is 1024, while the sum is 25.

Adding to 1220441121421 its reverse (1241211440221), we get a palindrome (2461652561642).

The spelling of 1220441121421 in words is "one trillion, two hundred twenty billion, four hundred forty-one million, one hundred twenty-one thousand, four hundred twenty-one".