21818362 has 4 divisors (see below), whose sum is σ = 32727546. Its totient is φ = 10909180.

The previous prime is 21818359. The next prime is 21818393. The reversal of 21818362 is 26381812.

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., 21818241 + 121 = 4671^2 + 11^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5454589 + ... + 5454592.

Almost surely, 2^21818362 is an apocalyptic number.

21818362 is a deficient number, since it is larger than the sum of its proper divisors (10909184).

21818362 is a wasteful number, since it uses less digits than its factorization.

21818362 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10909183.

The product of its digits is 4608, while the sum is 31.

The square root of 21818362 is about 4671.0129522407. The cubic root of 21818362 is about 279.4306543145.

The spelling of 21818362 in words is "twenty-one million, eight hundred eighteen thousand, three hundred sixty-two".