21150618 has 32 divisors (see below), whose sum is σ = 46241280. Its totient is φ = 6420480.

The previous prime is 21150607. The next prime is 21150631. The reversal of 21150618 is 81605112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183 + ... + 6506.

It is an arithmetic number, because the mean of its divisors is an integer number (1445040).

Almost surely, 2^21150618 is an apocalyptic number.

21150618 is an abundant number, since it is smaller than the sum of its proper divisors (25090662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21150618 is a wasteful number, since it uses less digits than its factorization.

21150618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6742.

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 21150618 is about 4598.9801043275. The cubic root of 21150618 is about 276.5504400436.

The spelling of 21150618 in words is "twenty-one million, one hundred fifty thousand, six hundred eighteen".