21042035 has 8 divisors (see below), whose sum is σ = 28857696. Its totient is φ = 14428800.

The previous prime is 21042017. The next prime is 21042053. The reversal of 21042035 is 53024012.

It is an interprime number because it is at equal distance from previous prime (21042017) and next prime (21042053).

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

It is not a de Polignac number, because 21042035 - 2¹⁰ = 21041011 is a prime.

It is an unprimeable number.

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, 300566 + ... + 300635.

It is an arithmetic number, because the mean of its divisors is an integer number (3607212).

Almost surely, 2^21042035 is an apocalyptic number.

21042035 is a deficient number, since it is larger than the sum of its proper divisors (7815661).

21042035 is an equidigital number, since it uses as much as digits as its factorization.

21042035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601213.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 21042035 is about 4587.1597966498. The cubic root of 21042035 is about 276.0763765032.

Adding to 21042035 its reverse (53024012), we get a palindrome (74066047).

The spelling of 21042035 in words is "twenty-one million, forty-two thousand, thirty-five".