21010336 has 24 divisors (see below), whose sum is σ = 41489280. Its totient is φ = 10473408.

The previous prime is 21010321. The next prime is 21010337. The reversal of 21010336 is 63301012.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (21010337) 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, 12625 + ... + 14191.

It is an arithmetic number, because the mean of its divisors is an integer number (1728720).

Almost surely, 2^21010336 is an apocalyptic number.

It is an amenable number.

21010336 is a deficient number, since it is larger than the sum of its proper divisors (20478944).

21010336 is a wasteful number, since it uses less digits than its factorization.

21010336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1996 (or 1988 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 21010336 is about 4583.7033062798. The cubic root of 21010336 is about 275.9376740875.

Adding to 21010336 its reverse (63301012), we get a palindrome (84311348).

The spelling of 21010336 in words is "twenty-one million, ten thousand, three hundred thirty-six".