21534032 has 20 divisors (see below), whose sum is σ = 44932020. Its totient is φ = 9938688.

The previous prime is 21534031. The next prime is 21534041. The reversal of 21534032 is 23043512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1784896 + 19749136 = 1336^2 + 4444^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21533995 and 21534013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51557 + ... + 51972.

It is an arithmetic number, because the mean of its divisors is an integer number (2246601).

Almost surely, 2^21534032 is an apocalyptic number.

It is an amenable number.

21534032 is an abundant number, since it is smaller than the sum of its proper divisors (23397988).

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

21534032 is a wasteful number, since it uses less digits than its factorization.

21534032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103550 (or 103544 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 21534032 is about 4640.4775616309. The cubic root of 21534032 is about 278.2115257783.

Adding to 21534032 its reverse (23043512), we get a palindrome (44577544).

The spelling of 21534032 in words is "twenty-one million, five hundred thirty-four thousand, thirty-two".