21383833 has 2 divisors, whose sum is σ = 21383834. Its totient is φ = 21383832.

The previous prime is 21383777. The next prime is 21383839. The reversal of 21383833 is 33838312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14768649 + 6615184 = 3843^2 + 2572^2 .

It is a cyclic number.

It is not a de Polignac number, because 21383833 - 2⁹ = 21383321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21383795 and 21383804.

It is not a weakly prime, because it can be changed into another prime (21383839) 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 as a sum of consecutive naturals, namely, 10691916 + 10691917.

It is an arithmetic number, because the mean of its divisors is an integer number (10691917).

Almost surely, 2^21383833 is an apocalyptic number.

It is an amenable number.

21383833 is a deficient number, since it is larger than the sum of its proper divisors (1).

21383833 is an equidigital number, since it uses as much as digits as its factorization.

21383833 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 31.

The square root of 21383833 is about 4624.2656714337. The cubic root of 21383833 is about 277.5631779968.

The spelling of 21383833 in words is "twenty-one million, three hundred eighty-three thousand, eight hundred thirty-three".