21824532 has 48 divisors (see below), whose sum is σ = 59915520. Its totient is φ = 6846336.

The previous prime is 21824531. The next prime is 21824533. The reversal of 21824532 is 23542812.

It is an interprime number because it is at equal distance from previous prime (21824531) and next prime (21824533).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21824496 and 21824505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21824531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4108 + ... + 7779.

It is an arithmetic number, because the mean of its divisors is an integer number (1248240).

Almost surely, 2^21824532 is an apocalyptic number.

It is an amenable number.

21824532 is an abundant number, since it is smaller than the sum of its proper divisors (38090988).

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

21824532 is a wasteful number, since it uses less digits than its factorization.

21824532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11917 (or 11909 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 21824532 is about 4671.6733618694. The cubic root of 21824532 is about 279.4569918346.

The spelling of 21824532 in words is "twenty-one million, eight hundred twenty-four thousand, five hundred thirty-two".