21532017 has 8 divisors (see below), whose sum is σ = 30917824. Its totient is φ = 13250448.

The previous prime is 21531989. The next prime is 21532019. The reversal of 21532017 is 71023512.

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

It is not a de Polignac number, because 21532017 - 2⁶ = 21531953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21531984 and 21532002.

It is not an unprimeable number, because it can be changed into a prime (21532019) 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, 276013 + ... + 276090.

It is an arithmetic number, because the mean of its divisors is an integer number (3864728).

Almost surely, 2^21532017 is an apocalyptic number.

It is an amenable number.

21532017 is a deficient number, since it is larger than the sum of its proper divisors (9385807).

21532017 is a wasteful number, since it uses less digits than its factorization.

21532017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552119.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 21532017 is about 4640.2604452768. The cubic root of 21532017 is about 278.2028478290.

Adding to 21532017 its reverse (71023512), we get a palindrome (92555529).

The spelling of 21532017 in words is "twenty-one million, five hundred thirty-two thousand, seventeen".