21366035 has 4 divisors (see below), whose sum is σ = 25639248. Its totient is φ = 17092824.

The previous prime is 21366017. The next prime is 21366041. The reversal of 21366035 is 53066312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21366035 - 2²⁴ = 4588819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21365995 and 21366013.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2136599 + ... + 2136608.

It is an arithmetic number, because the mean of its divisors is an integer number (6409812).

Almost surely, 2^21366035 is an apocalyptic number.

21366035 is a deficient number, since it is larger than the sum of its proper divisors (4273213).

21366035 is an equidigital number, since it uses as much as digits as its factorization.

21366035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4273212.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 21366035 is about 4622.3408571848. The cubic root of 21366035 is about 277.4861503247.

The spelling of 21366035 in words is "twenty-one million, three hundred sixty-six thousand, thirty-five".