21504030041 has 4 divisors (see below), whose sum is σ = 23158186212. Its totient is φ = 19849873872.

The previous prime is 21504030029. The next prime is 21504030047. The reversal of 21504030041 is 14003040512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1218010000 + 20286020041 = 34900^2 + 142429^2 .

It is a cyclic number.

It is not a de Polignac number, because 21504030041 - 2²² = 21499835737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21504029995 and 21504030022.

It is not an unprimeable number, because it can be changed into a prime (21504030047) 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, 827078066 + ... + 827078091.

It is an arithmetic number, because the mean of its divisors is an integer number (5789546553).

Almost surely, 2^21504030041 is an apocalyptic number.

It is an amenable number.

21504030041 is a deficient number, since it is larger than the sum of its proper divisors (1654156171).

21504030041 is a wasteful number, since it uses less digits than its factorization.

21504030041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654156170.

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21504030041 its reverse (14003040512), we get a palindrome (35507070553).

The spelling of 21504030041 in words is "twenty-one billion, five hundred four million, thirty thousand, forty-one".