21223032 has 16 divisors (see below), whose sum is σ = 53057640. Its totient is φ = 7074336.

The previous prime is 21223009. The next prime is 21223051. The reversal of 21223032 is 23032212.

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 3 ways as a sum of consecutive naturals, for example, 442123 + ... + 442170.

Almost surely, 2^21223032 is an apocalyptic number.

It is an amenable number.

21223032 is an abundant number, since it is smaller than the sum of its proper divisors (31834608).

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

21223032 is a wasteful number, since it uses less digits than its factorization.

21223032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884302 (or 884298 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 21223032 is about 4606.8462097187. The cubic root of 21223032 is about 276.8656918605.

Adding to 21223032 its reverse (23032212), we get a palindrome (44255244).

The spelling of 21223032 in words is "twenty-one million, two hundred twenty-three thousand, thirty-two".