21514286 has 4 divisors (see below), whose sum is σ = 32271432. Its totient is φ = 10757142.

The previous prime is 21514249. The next prime is 21514301. The reversal of 21514286 is 68241512.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5378570 + ... + 5378573.

It is an arithmetic number, because the mean of its divisors is an integer number (8067858).

Almost surely, 2^21514286 is an apocalyptic number.

21514286 is a deficient number, since it is larger than the sum of its proper divisors (10757146).

21514286 is a wasteful number, since it uses less digits than its factorization.

21514286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10757145.

The product of its digits is 3840, while the sum is 29.

The square root of 21514286 is about 4638.3494909289. The cubic root of 21514286 is about 278.1264628295.

Adding to 21514286 its reverse (68241512), we get a palindrome (89755798).

The spelling of 21514286 in words is "twenty-one million, five hundred fourteen thousand, two hundred eighty-six".