21140042541 has 16 divisors (see below), whose sum is σ = 28757250048. Its totient is φ = 13810302000.

The previous prime is 21140042503. The next prime is 21140042563. The reversal of 21140042541 is 14524004112.

It is not a de Polignac number, because 21140042541 - 2¹⁴ = 21140026157 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140042501) 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, 236935 + ... + 313716.

It is an arithmetic number, because the mean of its divisors is an integer number (1797328128).

Almost surely, 2^21140042541 is an apocalyptic number.

It is an amenable number.

21140042541 is a deficient number, since it is larger than the sum of its proper divisors (7617207507).

21140042541 is a wasteful number, since it uses less digits than its factorization.

21140042541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550912.

The product of its (nonzero) digits is 1280, while the sum is 24.

Adding to 21140042541 its reverse (14524004112), we get a palindrome (35664046653).

The spelling of 21140042541 in words is "twenty-one billion, one hundred forty million, forty-two thousand, five hundred forty-one".