21432488 has 48 divisors (see below), whose sum is σ = 50497440. Its totient is φ = 8347680.

The previous prime is 21432473. The next prime is 21432493. The reversal of 21432488 is 88423412.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5195 + ... + 8357.

It is an arithmetic number, because the mean of its divisors is an integer number (1052030).

Almost surely, 2^21432488 is an apocalyptic number.

21432488 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21432488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25248720).

21432488 is an abundant number, since it is smaller than the sum of its proper divisors (29064952).

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

21432488 is a wasteful number, since it uses less digits than its factorization.

21432488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3198 (or 3183 counting only the distinct ones).

The product of its digits is 12288, while the sum is 32.

The square root of 21432488 is about 4629.5235175988. The cubic root of 21432488 is about 277.7735332803.

It can be divided in two parts, 214324 and 88, that added together give a palindrome (214412).

The spelling of 21432488 in words is "twenty-one million, four hundred thirty-two thousand, four hundred eighty-eight".