21222132 has 24 divisors (see below), whose sum is σ = 49594272. Its totient is φ = 7063200.

The previous prime is 21222043. The next prime is 21222143. The reversal of 21222132 is 23122212.

It is a happy number.

It is a super-3 number, since 3×21222132³ (a number of 23 digits) contains 333 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12282 + ... + 13902.

It is an arithmetic number, because the mean of its divisors is an integer number (2066428).

Almost surely, 2^21222132 is an apocalyptic number.

It is an amenable number.

21222132 is an abundant number, since it is smaller than the sum of its proper divisors (28372140).

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

21222132 is a wasteful number, since it uses less digits than its factorization.

21222132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2719 (or 2717 counting only the distinct ones).

The product of its digits is 96, while the sum is 15.

The square root of 21222132 is about 4606.7485279750. The cubic root of 21222132 is about 276.8617781463.

Adding to 21222132 its reverse (23122212), we get a palindrome (44344344).

The spelling of 21222132 in words is "twenty-one million, two hundred twenty-two thousand, one hundred thirty-two".