21523142541 has 16 divisors (see below), whose sum is σ = 30318739200. Its totient is φ = 13559208768.

The previous prime is 21523142539. The next prime is 21523142567. The reversal of 21523142541 is 14524132512.

It is not a de Polignac number, because 21523142541 - 2¹ = 21523142539 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21523142499 and 21523142508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21523142591) 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, 2627746 + ... + 2635923.

It is an arithmetic number, because the mean of its divisors is an integer number (1894921200).

Almost surely, 2^21523142541 is an apocalyptic number.

It is an amenable number.

21523142541 is a deficient number, since it is larger than the sum of its proper divisors (8795596659).

21523142541 is a wasteful number, since it uses less digits than its factorization.

21523142541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5263748.

The product of its digits is 9600, while the sum is 30.

The spelling of 21523142541 in words is "twenty-one billion, five hundred twenty-three million, one hundred forty-two thousand, five hundred forty-one".