21835013 has 8 divisors (see below), whose sum is σ = 22406208. Its totient is φ = 21266784.

The previous prime is 21835007. The next prime is 21835019. The reversal of 21835013 is 31053812.

It is an interprime number because it is at equal distance from previous prime (21835007) and next prime (21835019).

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 21835013 - 2⁴ = 21834997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21835013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21835019) 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, 26120 + ... + 26942.

It is an arithmetic number, because the mean of its divisors is an integer number (2800776).

Almost surely, 2^21835013 is an apocalyptic number.

It is an amenable number.

21835013 is a deficient number, since it is larger than the sum of its proper divisors (571195).

21835013 is an equidigital number, since it uses as much as digits as its factorization.

21835013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1483.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 21835013 is about 4672.7949880131. The cubic root of 21835013 is about 279.5017200940.

Adding to 21835013 its reverse (31053812), we get a palindrome (52888825).

The spelling of 21835013 in words is "twenty-one million, eight hundred thirty-five thousand, thirteen".