1224111421 has 4 divisors (see below), whose sum is σ = 1318273852. Its totient is φ = 1129948992.

The previous prime is 1224111389. The next prime is 1224111439. The reversal of 1224111421 is 1241114221.

It is a happy number.

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 405579321 + 818532100 = 20139^2 + 28610^2 .

It is a cyclic number.

It is not a de Polignac number, because 1224111421 - 2⁵ = 1224111389 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 (1224111481) 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, 47081196 + ... + 47081221.

It is an arithmetic number, because the mean of its divisors is an integer number (329568463).

Almost surely, 2^1224111421 is an apocalyptic number.

It is an amenable number.

1224111421 is a deficient number, since it is larger than the sum of its proper divisors (94162431).

1224111421 is an equidigital number, since it uses as much as digits as its factorization.

1224111421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94162430.

The product of its digits is 128, while the sum is 19.

The square root of 1224111421 is about 34987.3037114894. The cubic root of 1224111421 is about 1069.7287054944.

Adding to 1224111421 its reverse (1241114221), we get a palindrome (2465225642).

It can be divided in two parts, 1 and 224111421, that added together give a palindrome (224111422).

The spelling of 1224111421 in words is "one billion, two hundred twenty-four million, one hundred eleven thousand, four hundred twenty-one".