22521450 has 96 divisors (see below), whose sum is σ = 64817280. Its totient is φ = 5068800.

The previous prime is 22521437. The next prime is 22521451. The reversal of 22521450 is 5412522.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (22521451) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 93330 + ... + 93570.

It is an arithmetic number, because the mean of its divisors is an integer number (675180).

Almost surely, 2^22521450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22521450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32408640).

22521450 is an abundant number, since it is smaller than the sum of its proper divisors (42295830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22521450 is a wasteful number, since it uses less digits than its factorization.

22521450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352 (or 347 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 22521450 is about 4745.6769801578. The cubic root of 22521450 is about 282.4004922723.

Adding to 22521450 its reverse (5412522), we get a palindrome (27933972).

The spelling of 22521450 in words is "twenty-two million, five hundred twenty-one thousand, four hundred fifty".