21531332041 has 16 divisors (see below), whose sum is σ = 22279510656. Its totient is φ = 20792491776.

The previous prime is 21531332023. The next prime is 21531332047. The reversal of 21531332041 is 14023313512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21531332041 - 2⁹ = 21531331529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21531331997 and 21531332015.

It is not an unprimeable number, because it can be changed into a prime (21531332047) 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, 2826660 + ... + 2834266.

It is an arithmetic number, because the mean of its divisors is an integer number (1392469416).

Almost surely, 2^21531332041 is an apocalyptic number.

It is an amenable number.

21531332041 is a deficient number, since it is larger than the sum of its proper divisors (748178615).

21531332041 is a wasteful number, since it uses less digits than its factorization.

21531332041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8208.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 21531332041 its reverse (14023313512), we get a palindrome (35554645553).

The spelling of 21531332041 in words is "twenty-one billion, five hundred thirty-one million, three hundred thirty-two thousand, forty-one".