21018362 has 4 divisors (see below), whose sum is σ = 31527546. Its totient is φ = 10509180.

The previous prime is 21018323. The next prime is 21018397. The reversal of 21018362 is 26381012.

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., 19193161 + 1825201 = 4381^2 + 1351^2 .

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 as a sum of consecutive naturals, namely, 5254589 + ... + 5254592.

Almost surely, 2^21018362 is an apocalyptic number.

21018362 is a deficient number, since it is larger than the sum of its proper divisors (10509184).

21018362 is a wasteful number, since it uses less digits than its factorization.

21018362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10509183.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 21018362 is about 4584.5787156510. The cubic root of 21018362 is about 275.9728059043.

Adding to 21018362 its reverse (26381012), we get a palindrome (47399374).

The spelling of 21018362 in words is "twenty-one million, eighteen thousand, three hundred sixty-two".