21105336 has 32 divisors (see below), whose sum is σ = 60301440. Its totient is φ = 6030048.

The previous prime is 21105307. The next prime is 21105341. The reversal of 21105336 is 63350112.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62646 + ... + 62981.

It is an arithmetic number, because the mean of its divisors is an integer number (1884420).

Almost surely, 2^21105336 is an apocalyptic number.

It is an amenable number.

21105336 is an abundant number, since it is smaller than the sum of its proper divisors (39196104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21105336 is a wasteful number, since it uses less digits than its factorization.

21105336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125643 (or 125639 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 21105336 is about 4594.0544184848. The cubic root of 21105336 is about 276.3529406221.

Adding to 21105336 its reverse (63350112), we get a palindrome (84455448).

The spelling of 21105336 in words is "twenty-one million, one hundred five thousand, three hundred thirty-six".