21113246 has 32 divisors (see below), whose sum is σ = 40338432. Its totient is φ = 8048160.

The previous prime is 21113243. The next prime is 21113251. The reversal of 21113246 is 64231112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113243) 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 15 ways as a sum of consecutive naturals, for example, 5780 + ... + 8696.

It is an arithmetic number, because the mean of its divisors is an integer number (1260576).

Almost surely, 2^21113246 is an apocalyptic number.

21113246 is a deficient number, since it is larger than the sum of its proper divisors (19225186).

21113246 is a wasteful number, since it uses less digits than its factorization.

21113246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2984.

The product of its digits is 288, while the sum is 20.

The square root of 21113246 is about 4594.9152331681. The cubic root of 21113246 is about 276.3874607821.

Adding to 21113246 its reverse (64231112), we get a palindrome (85344358).

The spelling of 21113246 in words is "twenty-one million, one hundred thirteen thousand, two hundred forty-six".