21523412041 has 4 divisors (see below), whose sum is σ = 21573350784. Its totient is φ = 21473473300.

The previous prime is 21523412023. The next prime is 21523412051. The reversal of 21523412041 is 14021432512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21523412041 - 2⁹ = 21523411529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21523411997 and 21523412015.

It is not an unprimeable number, because it can be changed into a prime (21523412051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24968725 + ... + 24969586.

It is an arithmetic number, because the mean of its divisors is an integer number (5393337696).

Almost surely, 2^21523412041 is an apocalyptic number.

It is an amenable number.

21523412041 is a deficient number, since it is larger than the sum of its proper divisors (49938743).

21523412041 is an equidigital number, since it uses as much as digits as its factorization.

21523412041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49938742.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21523412041 its reverse (14021432512), we get a palindrome (35544844553).

The spelling of 21523412041 in words is "twenty-one billion, five hundred twenty-three million, four hundred twelve thousand, forty-one".