21532044 has 24 divisors (see below), whose sum is σ = 50395968. Its totient is φ = 7155280.

The previous prime is 21532033. The next prime is 21532051. The reversal of 21532044 is 44023512.

It is a self number, because there is not a number n which added to its sum of digits gives 21532044.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1579 + ... + 6749.

It is an arithmetic number, because the mean of its divisors is an integer number (2099832).

Almost surely, 2^21532044 is an apocalyptic number.

It is an amenable number.

21532044 is an abundant number, since it is smaller than the sum of its proper divisors (28863924).

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

21532044 is a wasteful number, since it uses less digits than its factorization.

21532044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5525 (or 5523 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 21532044 is about 4640.2633545953. The cubic root of 21532044 is about 278.2029641128.

Adding to 21532044 its reverse (44023512), we get a palindrome (65555556).

The spelling of 21532044 in words is "twenty-one million, five hundred thirty-two thousand, forty-four".