21532434 has 96 divisors (see below), whose sum is σ = 57200640. Its totient is φ = 5274720.

The previous prime is 21532417. The next prime is 21532499. The reversal of 21532434 is 43423512.

It is a zygodrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 96447 + ... + 96669.

It is an arithmetic number, because the mean of its divisors is an integer number (595840).

Almost surely, 2^21532434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21532434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28600320).

21532434 is an abundant number, since it is smaller than the sum of its proper divisors (35668206).

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

21532434 is a wasteful number, since it uses less digits than its factorization.

21532434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 265 counting only the distinct ones).

The product of its digits is 2880, while the sum is 24.

The square root of 21532434 is about 4640.3053778819. The cubic root of 21532434 is about 278.2046437567.

Adding to 21532434 its reverse (43423512), we get a palindrome (64955946).

The spelling of 21532434 in words is "twenty-one million, five hundred thirty-two thousand, four hundred thirty-four".