22121532 has 48 divisors (see below), whose sum is σ = 57647520. Its totient is φ = 7335936.

The previous prime is 22121531. The next prime is 22121543. The reversal of 22121532 is 23512122.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27358 + ... + 28154.

It is an arithmetic number, because the mean of its divisors is an integer number (1200990).

Almost surely, 2^22121532 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22121532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28823760).

22121532 is an abundant number, since it is smaller than the sum of its proper divisors (35525988).

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

22121532 is a wasteful number, since it uses less digits than its factorization.

22121532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067 (or 1059 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 22121532 is about 4703.3532718689. The cubic root of 22121532 is about 280.7189516985.

Adding to 22121532 its reverse (23512122), we get a palindrome (45633654).

The spelling of 22121532 in words is "twenty-two million, one hundred twenty-one thousand, five hundred thirty-two".