21141286 has 4 divisors (see below), whose sum is σ = 31711932. Its totient is φ = 10570642.

The previous prime is 21141271. The next prime is 21141299. The reversal of 21141286 is 68214112.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21141286.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5285320 + ... + 5285323.

It is an arithmetic number, because the mean of its divisors is an integer number (7927983).

Almost surely, 2^21141286 is an apocalyptic number.

21141286 is a deficient number, since it is larger than the sum of its proper divisors (10570646).

21141286 is a wasteful number, since it uses less digits than its factorization.

21141286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10570645.

The product of its digits is 768, while the sum is 25.

The square root of 21141286 is about 4597.9654196177. The cubic root of 21141286 is about 276.5097611950.

Adding to 21141286 its reverse (68214112), we get a palindrome (89355398).

The spelling of 21141286 in words is "twenty-one million, one hundred forty-one thousand, two hundred eighty-six".