21106336 has 24 divisors (see below), whose sum is σ = 41659380. Its totient is φ = 10526208.

The previous prime is 21106331. The next prime is 21106343. The reversal of 21106336 is 63360112.

It can be written as a sum of positive squares in 2 ways, for example, as 18974736 + 2131600 = 4356^2 + 1460^2 .

It is not an unprimeable number, because it can be changed into a prime (21106331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19210 + ... + 20278.

Almost surely, 2^21106336 is an apocalyptic number.

It is an amenable number.

21106336 is a deficient number, since it is larger than the sum of its proper divisors (20553044).

21106336 is a wasteful number, since it uses less digits than its factorization.

21106336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696 (or 1688 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 21106336 is about 4594.1632535207. The cubic root of 21106336 is about 276.3573052147.

Adding to 21106336 its reverse (63360112), we get a palindrome (84466448).

The spelling of 21106336 in words is "twenty-one million, one hundred six thousand, three hundred thirty-six".