21032417 has 16 divisors (see below), whose sum is σ = 25977600. Its totient is φ = 16962624.

The previous prime is 21032399. The next prime is 21032437. The reversal of 21032417 is 71423012.

It is not a de Polignac number, because 21032417 - 2⁸ = 21032161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21032437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4028 + ... + 7634.

It is an arithmetic number, because the mean of its divisors is an integer number (1623600).

Almost surely, 2^21032417 is an apocalyptic number.

It is an amenable number.

21032417 is a deficient number, since it is larger than the sum of its proper divisors (4945183).

21032417 is an equidigital number, since it uses as much as digits as its factorization.

21032417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3645 (or 3631 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21032417 is about 4586.1113157009. Note that the first 3 decimals coincide. The cubic root of 21032417 is about 276.0343066296.

Adding to 21032417 its reverse (71423012), we get a palindrome (92455429).

The spelling of 21032417 in words is "twenty-one million, thirty-two thousand, four hundred seventeen".