22488421 has 4 divisors (see below), whose sum is σ = 22639500. Its totient is φ = 22337344.

The previous prime is 22488407. The next prime is 22488437. The reversal of 22488421 is 12488422.

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 12152196 + 10336225 = 3486^2 + 3215^2 .

It is a cyclic number.

It is not a de Polignac number, because 22488421 - 2⁷ = 22488293 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 (22488491) 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 3 ways as a sum of consecutive naturals, for example, 75316 + ... + 75613.

It is an arithmetic number, because the mean of its divisors is an integer number (5659875).

Almost surely, 2^22488421 is an apocalyptic number.

It is an amenable number.

22488421 is a deficient number, since it is larger than the sum of its proper divisors (151079).

22488421 is a wasteful number, since it uses less digits than its factorization.

22488421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151078.

The product of its digits is 8192, while the sum is 31.

The square root of 22488421 is about 4742.1957994161. The cubic root of 22488421 is about 282.2623725494.

Subtracting from 22488421 its reverse (12488422), we obtain a palindrome (9999999).

The spelling of 22488421 in words is "twenty-two million, four hundred eighty-eight thousand, four hundred twenty-one".