21532324 has 24 divisors (see below), whose sum is σ = 42896448. Its totient is φ = 9361440.

The previous prime is 21532309. The next prime is 21532327. The reversal of 21532324 is 42323512.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21532295 and 21532304.

It is not an unprimeable number, because it can be changed into a prime (21532327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9627 + ... + 11650.

It is an arithmetic number, because the mean of its divisors is an integer number (1787352).

Almost surely, 2^21532324 is an apocalyptic number.

It is an amenable number.

21532324 is a deficient number, since it is larger than the sum of its proper divisors (21364124).

21532324 is a wasteful number, since it uses less digits than its factorization.

21532324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21315 (or 21313 counting only the distinct ones).

The product of its digits is 1440, while the sum is 22.

The square root of 21532324 is about 4640.2935251986. The cubic root of 21532324 is about 278.2041700131.

Adding to 21532324 its reverse (42323512), we get a palindrome (63855836).

The spelling of 21532324 in words is "twenty-one million, five hundred thirty-two thousand, three hundred twenty-four".