21472332 has 48 divisors (see below), whose sum is σ = 57818880. Its totient is φ = 6075072.

The previous prime is 21472313. The next prime is 21472379. The reversal of 21472332 is 23327412.

It is a super-2 number, since 2×21472332² = 922122083036448, which contains 22 as substring.

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

It is an unprimeable number.

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, 7794 + ... + 10182.

It is an arithmetic number, because the mean of its divisors is an integer number (1204560).

Almost surely, 2^21472332 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 21472332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28909440).

21472332 is an abundant number, since it is smaller than the sum of its proper divisors (36346548).

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

21472332 is a wasteful number, since it uses less digits than its factorization.

21472332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2510 (or 2508 counting only the distinct ones).

The product of its digits is 2016, while the sum is 24.

The square root of 21472332 is about 4633.8247701008. The cubic root of 21472332 is about 277.9455580640.

Adding to 21472332 its reverse (23327412), we get a palindrome (44799744).

The spelling of 21472332 in words is "twenty-one million, four hundred seventy-two thousand, three hundred thirty-two".