1224434013421 has 4 divisors (see below), whose sum is σ = 1241207082172. Its totient is φ = 1207660944672.

The previous prime is 1224434013353. The next prime is 1224434013449. The reversal of 1224434013421 is 1243104344221.

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 411632595396 + 812801418025 = 641586^2 + 901555^2 .

It is a cyclic number.

It is not a de Polignac number, because 1224434013421 - 2¹¹ = 1224434011373 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 (1224434013221) 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, 8386534266 + ... + 8386534411.

It is an arithmetic number, because the mean of its divisors is an integer number (310301770543).

Almost surely, 2^{1224434013421} is an apocalyptic number.

It is an amenable number.

1224434013421 is a deficient number, since it is larger than the sum of its proper divisors (16773068751).

1224434013421 is an equidigital number, since it uses as much as digits as its factorization.

1224434013421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16773068750.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 1224434013421 its reverse (1243104344221), we get a palindrome (2467538357642).

The spelling of 1224434013421 in words is "one trillion, two hundred twenty-four billion, four hundred thirty-four million, thirteen thousand, four hundred twenty-one".