21106366 has 16 divisors (see below), whose sum is σ = 32484528. Its totient is φ = 10281600.

The previous prime is 21106361. The next prime is 21106369. The reversal of 21106366 is 66360112.

It is a self number, because there is not a number n which added to its sum of digits gives 21106366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13021 + ... + 14551.

It is an arithmetic number, because the mean of its divisors is an integer number (2030283).

Almost surely, 2^21106366 is an apocalyptic number.

21106366 is a deficient number, since it is larger than the sum of its proper divisors (11378162).

21106366 is a wasteful number, since it uses less digits than its factorization.

21106366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1707.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 21106366 is about 4594.1665185320. The cubic root of 21106366 is about 276.3574361503.

Adding to 21106366 its reverse (66360112), we get a palindrome (87466478).

The spelling of 21106366 in words is "twenty-one million, one hundred six thousand, three hundred sixty-six".