21432264 has 64 divisors (see below), whose sum is σ = 61645440. Its totient is φ = 6082560.

The previous prime is 21432263. The next prime is 21432277. The reversal of 21432264 is 46223412.

It is a Harshad number since it is a multiple of its sum of digits (24).

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

It is not an unprimeable number, because it can be changed into a prime (21432263) 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, 32094 + ... + 32754.

It is an arithmetic number, because the mean of its divisors is an integer number (963210).

Almost surely, 2^21432264 is an apocalyptic number.

21432264 is a gapful number since it is divisible by the number (24) 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 21432264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30822720).

21432264 is an abundant number, since it is smaller than the sum of its proper divisors (40213176).

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

21432264 is a wasteful number, since it uses less digits than its factorization.

21432264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870 (or 866 counting only the distinct ones).

The product of its digits is 2304, while the sum is 24.

The square root of 21432264 is about 4629.4993249811. The cubic root of 21432264 is about 277.7725655674.

Adding to 21432264 its reverse (46223412), we get a palindrome (67655676).

The spelling of 21432264 in words is "twenty-one million, four hundred thirty-two thousand, two hundred sixty-four".