21545000040041 has 8 divisors (see below), whose sum is σ = 21552392601600. Its totient is φ = 21537608289120.

The previous prime is 21545000039999. The next prime is 21545000040049. The reversal of 21545000040041 is 14004000054512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21545000040041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21545000040049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55575365 + ... + 55961693.

It is an arithmetic number, because the mean of its divisors is an integer number (2694049075200).

Almost surely, 2^{21545000040041} is an apocalyptic number.

It is an amenable number.

21545000040041 is a deficient number, since it is larger than the sum of its proper divisors (7392561559).

21545000040041 is a wasteful number, since it uses less digits than its factorization.

21545000040041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405319.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 21545000040041 its reverse (14004000054512), we get a palindrome (35549000094553).

The spelling of 21545000040041 in words is "twenty-one trillion, five hundred forty-five billion, forty thousand, forty-one".