21376736 has 24 divisors (see below), whose sum is σ = 42666624. Its totient is φ = 10540800.

The previous prime is 21376727. The next prime is 21376739. The reversal of 21376736 is 63767312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21376696 and 21376705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21376739) 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, 2240 + ... + 6911.

It is an arithmetic number, because the mean of its divisors is an integer number (1777776).

Almost surely, 2^21376736 is an apocalyptic number.

It is an amenable number.

21376736 is a deficient number, since it is larger than the sum of its proper divisors (21289888).

21376736 is an equidigital number, since it uses as much as digits as its factorization.

21376736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9234 (or 9226 counting only the distinct ones).

The product of its digits is 31752, while the sum is 35.

The square root of 21376736 is about 4623.4982426730. The cubic root of 21376736 is about 277.5324681324.

The spelling of 21376736 in words is "twenty-one million, three hundred seventy-six thousand, seven hundred thirty-six".