21033793 has 8 divisors (see below), whose sum is σ = 23137056. Its totient is φ = 19120420.

The previous prime is 21033781. The next prime is 21033809. The reversal of 21033793 is 39733012.

It is not a de Polignac number, because 21033793 - 2¹³ = 21025601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21033763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6571 + ... + 9232.

It is an arithmetic number, because the mean of its divisors is an integer number (2892132).

Almost surely, 2^21033793 is an apocalyptic number.

It is an amenable number.

21033793 is a deficient number, since it is larger than the sum of its proper divisors (2103263).

21033793 is an equidigital number, since it uses as much as digits as its factorization.

21033793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15836 (or 15814 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 28.

The square root of 21033793 is about 4586.2613314115. The cubic root of 21033793 is about 276.0403261458.

The spelling of 21033793 in words is "twenty-one million, thirty-three thousand, seven hundred ninety-three".