21632341 has 4 divisors (see below), whose sum is σ = 21656800. Its totient is φ = 21607884.

The previous prime is 21632339. The next prime is 21632399. The reversal of 21632341 is 14323612.

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 21632341 - 2¹ = 21632339 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21632641) 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, 10851 + ... + 12688.

It is an arithmetic number, because the mean of its divisors is an integer number (5414200).

Almost surely, 2^21632341 is an apocalyptic number.

It is an amenable number.

21632341 is a deficient number, since it is larger than the sum of its proper divisors (24459).

21632341 is an equidigital number, since it uses as much as digits as its factorization.

21632341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24458.

The product of its digits is 864, while the sum is 22.

The square root of 21632341 is about 4651.0580516695. The cubic root of 21632341 is about 278.6342548006.

Adding to 21632341 its reverse (14323612), we get a palindrome (35955953).

The spelling of 21632341 in words is "twenty-one million, six hundred thirty-two thousand, three hundred forty-one".