21532134 has 32 divisors (see below), whose sum is σ = 47515104. Its totient is φ = 6462720.

The previous prime is 21532097. The next prime is 21532169. The reversal of 21532134 is 43123512.

It is a self number, because there is not a number n which added to its sum of digits gives 21532134.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169 + ... + 6564.

It is an arithmetic number, because the mean of its divisors is an integer number (1484847).

Almost surely, 2^21532134 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21532134, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23757552).

21532134 is an abundant number, since it is smaller than the sum of its proper divisors (25982970).

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

21532134 is a wasteful number, since it uses less digits than its factorization.

21532134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6792.

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

The square root of 21532134 is about 4640.2730523106. The cubic root of 21532134 is about 278.2033517247.

Adding to 21532134 its reverse (43123512), we get a palindrome (64655646).

The spelling of 21532134 in words is "twenty-one million, five hundred thirty-two thousand, one hundred thirty-four".