21534341 has 4 divisors (see below), whose sum is σ = 21544800. Its totient is φ = 21523884.

The previous prime is 21534329. The next prime is 21534349. The reversal of 21534341 is 14343512.

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 21534341 - 2¹⁴ = 21517957 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 (21534349) 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, 1001 + ... + 6638.

It is an arithmetic number, because the mean of its divisors is an integer number (5386200).

Almost surely, 2^21534341 is an apocalyptic number.

It is an amenable number.

21534341 is a deficient number, since it is larger than the sum of its proper divisors (10459).

21534341 is an equidigital number, since it uses as much as digits as its factorization.

21534341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10458.

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

The square root of 21534341 is about 4640.5108554986. The cubic root of 21534341 is about 278.2128564928.

Adding to 21534341 its reverse (14343512), we get a palindrome (35877853).

The spelling of 21534341 in words is "twenty-one million, five hundred thirty-four thousand, three hundred forty-one".