21793741 has 4 divisors (see below), whose sum is σ = 22940800. Its totient is φ = 20646684.

The previous prime is 21793721. The next prime is 21793747. The reversal of 21793741 is 14739712.

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.

It is a cyclic number.

It is not a de Polignac number, because 21793741 - 2⁷ = 21793613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21793697 and 21793706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21793747) 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 3 ways as a sum of consecutive naturals, for example, 573501 + ... + 573538.

It is an arithmetic number, because the mean of its divisors is an integer number (5735200).

Almost surely, 2^21793741 is an apocalyptic number.

It is an amenable number.

21793741 is a deficient number, since it is larger than the sum of its proper divisors (1147059).

21793741 is a wasteful number, since it uses less digits than its factorization.

21793741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147058.

The product of its digits is 10584, while the sum is 34.

The square root of 21793741 is about 4668.3766985966. The cubic root of 21793741 is about 279.3255066163.

The spelling of 21793741 in words is "twenty-one million, seven hundred ninety-three thousand, seven hundred forty-one".