21035013 has 4 divisors (see below), whose sum is σ = 28046688. Its totient is φ = 14023340.

The previous prime is 21034999. The next prime is 21035029. The reversal of 21035013 is 31053012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21035013 - 2⁴ = 21034997 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21034983 and 21035001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3505833 + ... + 3505838.

It is an arithmetic number, because the mean of its divisors is an integer number (7011672).

Almost surely, 2^21035013 is an apocalyptic number.

It is an amenable number.

21035013 is a deficient number, since it is larger than the sum of its proper divisors (7011675).

21035013 is an equidigital number, since it uses as much as digits as its factorization.

21035013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7011674.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 21035013 is about 4586.3943354230. The cubic root of 21035013 is about 276.0456629972.

Adding to 21035013 its reverse (31053012), we get a palindrome (52088025).

The spelling of 21035013 in words is "twenty-one million, thirty-five thousand, thirteen".