1224045421 has 4 divisors (see below), whose sum is σ = 1226283712. Its totient is φ = 1221807132.

The previous prime is 1224045419. The next prime is 1224045443. The reversal of 1224045421 is 1245404221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1245404221 = 3583 ⋅347587.

It is a cyclic number.

It is not a de Polignac number, because 1224045421 - 2¹ = 1224045419 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 (1224045401) 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, 1118325 + ... + 1119418.

It is an arithmetic number, because the mean of its divisors is an integer number (306570928).

Almost surely, 2^1224045421 is an apocalyptic number.

It is an amenable number.

1224045421 is a deficient number, since it is larger than the sum of its proper divisors (2238291).

1224045421 is an equidigital number, since it uses as much as digits as its factorization.

1224045421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2238290.

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 1224045421 is about 34986.3604994861. The cubic root of 1224045421 is about 1069.7094797490.

Adding to 1224045421 its reverse (1245404221), we get a palindrome (2469449642).

The spelling of 1224045421 in words is "one billion, two hundred twenty-four million, forty-five thousand, four hundred twenty-one".