21484618 has 4 divisors (see below), whose sum is σ = 32226930. Its totient is φ = 10742308.

The previous prime is 21484607. The next prime is 21484669. The reversal of 21484618 is 81648412.

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

It can be written as a sum of positive squares in only one way, i.e., 18550249 + 2934369 = 4307^2 + 1713^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5371153 + ... + 5371156.

Almost surely, 2^21484618 is an apocalyptic number.

21484618 is a deficient number, since it is larger than the sum of its proper divisors (10742312).

21484618 is a wasteful number, since it uses less digits than its factorization.

21484618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10742311.

The product of its digits is 12288, while the sum is 34.

The square root of 21484618 is about 4635.1502672513. The cubic root of 21484618 is about 277.9985594184.

The spelling of 21484618 in words is "twenty-one million, four hundred eighty-four thousand, six hundred eighteen".