21336801 has 16 divisors (see below), whose sum is σ = 29859840. Its totient is φ = 13526480.

The previous prime is 21336787. The next prime is 21336803. The reversal of 21336801 is 10863312.

It is a cyclic number.

It is not a de Polignac number, because 21336801 - 2¹⁰ = 21335777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21336803) 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, 12370 + ... + 13988.

It is an arithmetic number, because the mean of its divisors is an integer number (1866240).

Almost surely, 2^21336801 is an apocalyptic number.

It is an amenable number.

21336801 is a deficient number, since it is larger than the sum of its proper divisors (8523039).

21336801 is a wasteful number, since it uses less digits than its factorization.

21336801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1836.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21336801 is about 4619.1775241919. The cubic root of 21336801 is about 277.3595360872.

The spelling of 21336801 in words is "twenty-one million, three hundred thirty-six thousand, eight hundred one".