1224401101221 has 4 divisors (see below), whose sum is σ = 1632534801632. Its totient is φ = 816267400812.

The previous prime is 1224401101181. The next prime is 1224401101223. The reversal of 1224401101221 is 1221011044221.

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 not a de Polignac number, because 1224401101221 - 2⁹ = 1224401100709 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 (1224401101223) 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, 204066850201 + ... + 204066850206.

It is an arithmetic number, because the mean of its divisors is an integer number (408133700408).

Almost surely, 2^{1224401101221} is an apocalyptic number.

It is an amenable number.

1224401101221 is a deficient number, since it is larger than the sum of its proper divisors (408133700411).

1224401101221 is an equidigital number, since it uses as much as digits as its factorization.

1224401101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408133700410.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 1224401101221 its reverse (1221011044221), we get a palindrome (2445412145442).

The spelling of 1224401101221 in words is "one trillion, two hundred twenty-four billion, four hundred one million, one hundred one thousand, two hundred twenty-one".