22242421 has 6 divisors (see below), whose sum is σ = 22727990. Its totient is φ = 21767016.

The previous prime is 22242419. The next prime is 22242427. The reversal of 22242421 is 12424222.

It can be written as a sum of positive squares in only one way, i.e., 16719921 + 5522500 = 4089^2 + 2350^2 .

It is not a de Polignac number, because 22242421 - 2¹ = 22242419 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 (22242427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2826 + ... + 7243.

Almost surely, 2^22242421 is an apocalyptic number.

It is an amenable number.

22242421 is a deficient number, since it is larger than the sum of its proper divisors (485569).

22242421 is an equidigital number, since it uses as much as digits as its factorization.

22242421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10163 (or 10116 counting only the distinct ones).

The product of its digits is 512, while the sum is 19.

The square root of 22242421 is about 4716.1871252104. The cubic root of 22242421 is about 281.2293775167.

Adding to 22242421 its reverse (12424222), we get a palindrome (34666643).

The spelling of 22242421 in words is "twenty-two million, two hundred forty-two thousand, four hundred twenty-one".