21035618 has 8 divisors (see below), whose sum is σ = 31594860. Its totient is φ = 10504000.

The previous prime is 21035617. The next prime is 21035621. The reversal of 21035618 is 81653012.

It can be written as a sum of positive squares in 2 ways, for example, as 20729809 + 305809 = 4553^2 + 553^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21035611) 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 3 ways as a sum of consecutive naturals, for example, 4883 + ... + 8118.

Almost surely, 2^21035618 is an apocalyptic number.

21035618 is a deficient number, since it is larger than the sum of its proper divisors (10559242).

21035618 is a wasteful number, since it uses less digits than its factorization.

21035618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13812.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 21035618 is about 4586.4602908997. The cubic root of 21035618 is about 276.0483094741.

The spelling of 21035618 in words is "twenty-one million, thirty-five thousand, six hundred eighteen".