21534132 has 24 divisors (see below), whose sum is σ = 50321376. Its totient is φ = 7167328.

The previous prime is 21534089. The next prime is 21534151. The reversal of 21534132 is 23143512.

It is a junction number, because it is equal to n+sod(n) for n = 21534099 and 21534108.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 14998 + ... + 16370.

It is an arithmetic number, because the mean of its divisors is an integer number (2096724).

Almost surely, 2^21534132 is an apocalyptic number.

It is an amenable number.

21534132 is an abundant number, since it is smaller than the sum of its proper divisors (28787244).

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

21534132 is a wasteful number, since it uses less digits than its factorization.

21534132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2687 (or 2685 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 21534132 is about 4640.4883363715. The cubic root of 21534132 is about 278.2119564316.

Adding to 21534132 its reverse (23143512), we get a palindrome (44677644).

The spelling of 21534132 in words is "twenty-one million, five hundred thirty-four thousand, one hundred thirty-two".