21534832 has 40 divisors (see below), whose sum is σ = 46996992. Its totient is φ = 9470400.

The previous prime is 21534829. The next prime is 21534833. The reversal of 21534832 is 23843512.

It is a self number, because there is not a number n which added to its sum of digits gives 21534832.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534833) 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, 3483 + ... + 7429.

Almost surely, 2^21534832 is an apocalyptic number.

21534832 is a gapful number since it is divisible by the number (22) 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 21534832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23498496).

21534832 is an abundant number, since it is smaller than the sum of its proper divisors (25462160).

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

21534832 is a wasteful number, since it uses less digits than its factorization.

21534832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3997 (or 3991 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 21534832 is about 4640.5637588552. The cubic root of 21534832 is about 278.2149709678.

It can be divided in two parts, 21534 and 832, that added together give a triangular number (22366 = T₂₁₁).

The spelling of 21534832 in words is "twenty-one million, five hundred thirty-four thousand, eight hundred thirty-two".