21218062 has 8 divisors (see below), whose sum is σ = 31908456. Its totient is φ = 10581912.

The previous prime is 21218059. The next prime is 21218069. The reversal of 21218062 is 26081212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21218069) 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, 12568 + ... + 14155.

It is an arithmetic number, because the mean of its divisors is an integer number (3988557).

Almost surely, 2^21218062 is an apocalyptic number.

21218062 is a deficient number, since it is larger than the sum of its proper divisors (10690394).

21218062 is a wasteful number, since it uses less digits than its factorization.

21218062 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27122.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 21218062 is about 4606.3067635580. The cubic root of 21218062 is about 276.8440780792.

Adding to 21218062 its reverse (26081212), we get a palindrome (47299274).

The spelling of 21218062 in words is "twenty-one million, two hundred eighteen thousand, sixty-two".