21636014 has 4 divisors (see below), whose sum is σ = 32454024. Its totient is φ = 10818006.

The previous prime is 21636007. The next prime is 21636023. The reversal of 21636014 is 41063612.

It is a happy number.

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, 5409002 + ... + 5409005.

It is an arithmetic number, because the mean of its divisors is an integer number (8113506).

Almost surely, 2^21636014 is an apocalyptic number.

21636014 is a deficient number, since it is larger than the sum of its proper divisors (10818010).

21636014 is a wasteful number, since it uses less digits than its factorization.

21636014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10818009.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 21636014 is about 4651.4528913018. The cubic root of 21636014 is about 278.6500238707.

Adding to 21636014 its reverse (41063612), we get a palindrome (62699626).

The spelling of 21636014 in words is "twenty-one million, six hundred thirty-six thousand, fourteen".