41511521221 has 4 divisors (see below), whose sum is σ = 41578801452. Its totient is φ = 41444240992.

The previous prime is 41511521209. The next prime is 41511521237. The reversal of 41511521221 is 12212511514.

41511521221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 22793450625 + 18718070596 = 150975^2 + 136814^2 .

It is a cyclic number.

It is not a de Polignac number, because 41511521221 - 2²³ = 41503132613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (41511521251) 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, 33639190 + ... + 33640423.

It is an arithmetic number, because the mean of its divisors is an integer number (10394700363).

Almost surely, 2^41511521221 is an apocalyptic number.

It is an amenable number.

41511521221 is a deficient number, since it is larger than the sum of its proper divisors (67280231).

41511521221 is an equidigital number, since it uses as much as digits as its factorization.

41511521221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67280230.

The product of its digits is 800, while the sum is 25.

The spelling of 41511521221 in words is "forty-one billion, five hundred eleven million, five hundred twenty-one thousand, two hundred twenty-one".