22552421 has 4 divisors (see below), whose sum is σ = 23879052.
Its totient is φ = 21225792.
The previous prime is 22552417. The next prime is 22552423. The reversal of 22552421 is 12425522.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12425522 = 2 ⋅6212761.
It can be written as a sum of positive squares in 2 ways, for example, as 19624900 + 2927521 = 4430^2 + 1711^2
It is not a de Polignac number, because 22552421 - 22 = 22552417 is a prime.
It is a super-2 number, since 2×225524212 = 1017223385922482, which contains 22 as substring.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (22552423) 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, 663290 + ... + 663323.
It is an arithmetic number, because the mean of its divisors is an integer number (5969763).
Almost surely, 222552421 is an apocalyptic number.
It is an amenable number.
22552421 is a deficient number, since it is larger than the sum of its proper divisors (1326631).
22552421 is a wasteful number, since it uses less digits than its factorization.
22552421 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1326630.
The product of its digits is 1600, while the sum is 23.
The square root of 22552421 is about 4748.9389341199.
The cubic root of 22552421 is about 282.5298832825.
Adding to 22552421 its reverse (12425522), we get a palindrome (34977943).
The spelling of 22552421 in words is "twenty-two million, five hundred fifty-two thousand, four hundred twenty-one".