21532441 has 8 divisors (see below), whose sum is σ = 24905664. Its totient is φ = 18233520.

The previous prime is 21532417. The next prime is 21532499. The reversal of 21532441 is 14423512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21532441 - 2¹¹ = 21530393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21532541) by changing a digit.

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, 17950 + ... + 19111.

It is an arithmetic number, because the mean of its divisors is an integer number (3113208).

Almost surely, 2^21532441 is an apocalyptic number.

It is an amenable number.

21532441 is a deficient number, since it is larger than the sum of its proper divisors (3373223).

21532441 is an equidigital number, since it uses as much as digits as its factorization.

21532441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37151.

The product of its digits is 960, while the sum is 22.

The square root of 21532441 is about 4640.3061321426. The cubic root of 21532441 is about 278.2046739040.

Adding to 21532441 its reverse (14423512), we get a palindrome (35955953).

The spelling of 21532441 in words is "twenty-one million, five hundred thirty-two thousand, four hundred forty-one".