21335793 has 16 divisors (see below), whose sum is σ = 29548800. Its totient is φ = 13677440.

The previous prime is 21335779. The next prime is 21335801. The reversal of 21335793 is 39753312.

It is a cyclic number.

It is not a de Polignac number, because 21335793 - 2⁴ = 21335777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21335593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37213 + ... + 37781.

It is an arithmetic number, because the mean of its divisors is an integer number (1846800).

Almost surely, 2^21335793 is an apocalyptic number.

It is an amenable number.

21335793 is a deficient number, since it is larger than the sum of its proper divisors (8213007).

21335793 is a wasteful number, since it uses less digits than its factorization.

21335793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032.

The product of its digits is 17010, while the sum is 33.

The square root of 21335793 is about 4619.0684125698. The cubic root of 21335793 is about 277.3551683157.

It can be divided in two parts, 2 and 1335793, that added together give a triangular number (1335795 = T₁₆₃₄).

The spelling of 21335793 in words is "twenty-one million, three hundred thirty-five thousand, seven hundred ninety-three".