21024235 has 8 divisors (see below), whose sum is σ = 25270416. Its totient is φ = 16791840.

The previous prime is 21024221. The next prime is 21024253. The reversal of 21024235 is 53242012.

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

It is a de Polignac number, because none of the positive numbers 2^k-21024235 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280 + ... + 6490.

It is an arithmetic number, because the mean of its divisors is an integer number (3158802).

Almost surely, 2^21024235 is an apocalyptic number.

21024235 is a deficient number, since it is larger than the sum of its proper divisors (4246181).

21024235 is an equidigital number, since it uses as much as digits as its factorization.

21024235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6893.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21024235 is about 4585.2191877815. The cubic root of 21024235 is about 275.9985078334.

Adding to 21024235 its reverse (53242012), we get a palindrome (74266247).

The spelling of 21024235 in words is "twenty-one million, twenty-four thousand, two hundred thirty-five".