22424004021 has 4 divisors (see below), whose sum is σ = 29898672032. Its totient is φ = 14949336012.

The previous prime is 22424003981. The next prime is 22424004059. The reversal of 22424004021 is 12040042422.

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 22424004021 - 2²¹ = 22421906869 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 (22424004091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3737334001 + ... + 3737334006.

It is an arithmetic number, because the mean of its divisors is an integer number (7474668008).

Almost surely, 2^22424004021 is an apocalyptic number.

It is an amenable number.

22424004021 is a deficient number, since it is larger than the sum of its proper divisors (7474668011).

22424004021 is an equidigital number, since it uses as much as digits as its factorization.

22424004021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7474668010.

The product of its (nonzero) digits is 1024, while the sum is 21.

Adding to 22424004021 its reverse (12040042422), we get a palindrome (34464046443).

The spelling of 22424004021 in words is "twenty-two billion, four hundred twenty-four million, four thousand, twenty-one".