21540332341 has 16 divisors (see below), whose sum is σ = 25018314048. Its totient is φ = 18328377600.

The previous prime is 21540332339. The next prime is 21540332377. The reversal of 21540332341 is 14323304512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21540332341 - 2¹ = 21540332339 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 (21540332381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284355 + ... + 352048.

It is an arithmetic number, because the mean of its divisors is an integer number (1563644628).

Almost surely, 2^21540332341 is an apocalyptic number.

It is an amenable number.

21540332341 is a deficient number, since it is larger than the sum of its proper divisors (3477981707).

21540332341 is a wasteful number, since it uses less digits than its factorization.

21540332341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636612.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 21540332341 its reverse (14323304512), we get a palindrome (35863636853).

The spelling of 21540332341 in words is "twenty-one billion, five hundred forty million, three hundred thirty-two thousand, three hundred forty-one".