21634341 has 4 divisors (see below), whose sum is σ = 28845792. Its totient is φ = 14422892.

The previous prime is 21634337. The next prime is 21634399. The reversal of 21634341 is 14343612.

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 21634341 - 2² = 21634337 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21634541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3605721 + ... + 3605726.

It is an arithmetic number, because the mean of its divisors is an integer number (7211448).

Almost surely, 2^21634341 is an apocalyptic number.

It is an amenable number.

21634341 is a deficient number, since it is larger than the sum of its proper divisors (7211451).

21634341 is an equidigital number, since it uses as much as digits as its factorization.

21634341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7211450.

The product of its digits is 1728, while the sum is 24.

The square root of 21634341 is about 4651.2730515419. The cubic root of 21634341 is about 278.6428415017.

Adding to 21634341 its reverse (14343612), we get a palindrome (35977953).

The spelling of 21634341 in words is "twenty-one million, six hundred thirty-four thousand, three hundred forty-one".