21893741 has 4 divisors (see below), whose sum is σ = 21904992. Its totient is φ = 21882492.

The previous prime is 21893699. The next prime is 21893747. The reversal of 21893741 is 14739812.

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 a de Polignac number, because none of the positive numbers 2^k-21893741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21893747) 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, 1871 + ... + 6876.

It is an arithmetic number, because the mean of its divisors is an integer number (5476248).

Almost surely, 2^21893741 is an apocalyptic number.

It is an amenable number.

21893741 is a deficient number, since it is larger than the sum of its proper divisors (11251).

21893741 is an equidigital number, since it uses as much as digits as its factorization.

21893741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11250.

The product of its digits is 12096, while the sum is 35.

The square root of 21893741 is about 4679.0748017103. The cubic root of 21893741 is about 279.7520807207.

The spelling of 21893741 in words is "twenty-one million, eight hundred ninety-three thousand, seven hundred forty-one".