21440512040541 has 64 divisors (see below), whose sum is σ = 32397997731840. Its totient is φ = 12497503772160.

The previous prime is 21440512040459. The next prime is 21440512040551. The reversal of 21440512040541 is 14504021504412.

It is not a de Polignac number, because 21440512040541 - 2⁹ = 21440512040029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440512040551) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 418024000 + ... + 418075286.

It is an arithmetic number, because the mean of its divisors is an integer number (506218714560).

Almost surely, 2^{21440512040541} is an apocalyptic number.

It is an amenable number.

21440512040541 is a deficient number, since it is larger than the sum of its proper divisors (10957485691299).

21440512040541 is a wasteful number, since it uses less digits than its factorization.

21440512040541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55274.

The product of its (nonzero) digits is 25600, while the sum is 33.

Adding to 21440512040541 its reverse (14504021504412), we get a palindrome (35944533544953).

The spelling of 21440512040541 in words is "twenty-one trillion, four hundred forty billion, five hundred twelve million, forty thousand, five hundred forty-one".