21336803 has 2 divisors, whose sum is σ = 21336804. Its totient is φ = 21336802.

The previous prime is 21336787. The next prime is 21336839. The reversal of 21336803 is 30863312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21336803 - 2⁴ = 21336787 is a prime.

It is not a weakly prime, because it can be changed into another prime (21336103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10668401 + 10668402.

It is an arithmetic number, because the mean of its divisors is an integer number (10668402).

Almost surely, 2^21336803 is an apocalyptic number.

21336803 is a deficient number, since it is larger than the sum of its proper divisors (1).

21336803 is an equidigital number, since it uses as much as digits as its factorization.

21336803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 21336803 is about 4619.1777406807. The cubic root of 21336803 is about 277.3595447533.

The spelling of 21336803 in words is "twenty-one million, three hundred thirty-six thousand, eight hundred three".