21416536 has 16 divisors (see below), whose sum is σ = 41451840. Its totient is φ = 10362720.

The previous prime is 21416531. The next prime is 21416539. The reversal of 21416536 is 63561412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21416531) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 42931 + ... + 43426.

It is an arithmetic number, because the mean of its divisors is an integer number (2590740).

Almost surely, 2^21416536 is an apocalyptic number.

It is an amenable number.

21416536 is a deficient number, since it is larger than the sum of its proper divisors (20035304).

21416536 is a wasteful number, since it uses less digits than its factorization.

21416536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86394 (or 86390 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 21416536 is about 4627.8003414149. The cubic root of 21416536 is about 277.7046014297.

Adding to 21416536 its reverse (63561412), we get a palindrome (84977948).

It can be divided in two parts, 21416 and 536, that added together give a cube (21952 = 28³).

The spelling of 21416536 in words is "twenty-one million, four hundred sixteen thousand, five hundred thirty-six".