1224004113221 has 4 divisors (see below), whose sum is σ = 1224064154412. Its totient is φ = 1223944072032.

The previous prime is 1224004113217. The next prime is 1224004113329. The reversal of 1224004113221 is 1223114004221.

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 416676705025 + 807327408196 = 645505^2 + 898514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1224004113221 - 2² = 1224004113217 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 (1224004143221) 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, 29990006 + ... + 30030791.

It is an arithmetic number, because the mean of its divisors is an integer number (306016038603).

Almost surely, 2^{1224004113221} is an apocalyptic number.

It is an amenable number.

1224004113221 is a deficient number, since it is larger than the sum of its proper divisors (60041191).

1224004113221 is an equidigital number, since it uses as much as digits as its factorization.

1224004113221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60041190.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 1224004113221 its reverse (1223114004221), we get a palindrome (2447118117442).

The spelling of 1224004113221 in words is "one trillion, two hundred twenty-four billion, four million, one hundred thirteen thousand, two hundred twenty-one".