21843741 has 4 divisors (see below), whose sum is σ = 29124992. Its totient is φ = 14562492.

The previous prime is 21843739. The next prime is 21843743. The reversal of 21843741 is 14734812.

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 an interprime number because it is at equal distance from previous prime (21843739) and next prime (21843743).

It is not a de Polignac number, because 21843741 - 2¹ = 21843739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21843699 and 21843708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21843743) 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, 3640621 + ... + 3640626.

It is an arithmetic number, because the mean of its divisors is an integer number (7281248).

Almost surely, 2^21843741 is an apocalyptic number.

It is an amenable number.

21843741 is a deficient number, since it is larger than the sum of its proper divisors (7281251).

21843741 is an equidigital number, since it uses as much as digits as its factorization.

21843741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7281250.

The product of its digits is 5376, while the sum is 30.

The square root of 21843741 is about 4673.7288111314. The cubic root of 21843741 is about 279.5389564056.

The spelling of 21843741 in words is "twenty-one million, eight hundred forty-three thousand, seven hundred forty-one".