21133793 has 4 divisors (see below), whose sum is σ = 21143808. Its totient is φ = 21123780.

The previous prime is 21133787. The next prime is 21133813. The reversal of 21133793 is 39733112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21133793 - 2¹⁴ = 21117409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 473 + ... + 6518.

It is an arithmetic number, because the mean of its divisors is an integer number (5285952).

Almost surely, 2^21133793 is an apocalyptic number.

It is an amenable number.

21133793 is a deficient number, since it is larger than the sum of its proper divisors (10015).

21133793 is an equidigital number, since it uses as much as digits as its factorization.

21133793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10014.

The product of its digits is 3402, while the sum is 29.

The square root of 21133793 is about 4597.1505304917. The cubic root of 21133793 is about 276.4770900121.

The spelling of 21133793 in words is "twenty-one million, one hundred thirty-three thousand, seven hundred ninety-three".