21035 has 8 divisors (see below), whose sum is σ = 28896. Its totient is φ = 14400.

The previous prime is 21031. The next prime is 21059. The reversal of 21035 is 53012.

21035 = T₇₄ + T₇₅ + ... + T₈₀.

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

It is not a de Polignac number, because 21035 - 2² = 21031 is a prime.

It is a nialpdrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 21035.

It is not an unprimeable number, because it can be changed into a prime (21031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266 + ... + 335.

It is an arithmetic number, because the mean of its divisors is an integer number (3612).

2²¹⁰³⁵ is an apocalyptic number.

21035 is a deficient number, since it is larger than the sum of its proper divisors (7861).

21035 is an equidigital number, since it uses as much as digits as its factorization.

21035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613.

The product of its (nonzero) digits is 30, while the sum is 11.

The square root of 21035 is about 145.0344786594. The cubic root of 21035 is about 27.6045606130.

Adding to 21035 its reverse (53012), we get a palindrome (74047).

The spelling of 21035 in words is "twenty-one thousand, thirty-five".