21354341 has 4 divisors (see below), whose sum is σ = 21364512. Its totient is φ = 21344172.

The previous prime is 21354337. The next prime is 21354343. The reversal of 21354341 is 14345312.

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 21354341 - 2² = 21354337 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 (21354343) 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, 641 + ... + 6566.

It is an arithmetic number, because the mean of its divisors is an integer number (5341128).

Almost surely, 2^21354341 is an apocalyptic number.

It is an amenable number.

21354341 is a deficient number, since it is larger than the sum of its proper divisors (10171).

21354341 is an equidigital number, since it uses as much as digits as its factorization.

21354341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10170.

The product of its digits is 1440, while the sum is 23.

The square root of 21354341 is about 4621.0757405608. The cubic root of 21354341 is about 277.4355167650.

Adding to 21354341 its reverse (14345312), we get a palindrome (35699653).

The spelling of 21354341 in words is "twenty-one million, three hundred fifty-four thousand, three hundred forty-one".