41505521621 has 4 divisors (see below), whose sum is σ = 41518548192. Its totient is φ = 41492495052.

The previous prime is 41505521609. The next prime is 41505521639. The reversal of 41505521621 is 12612550514.

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 41505521621 - 2³⁴ = 24325652437 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 (41505521671) 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, 6508505 + ... + 6514878.

It is an arithmetic number, because the mean of its divisors is an integer number (10379637048).

Almost surely, 2^41505521621 is an apocalyptic number.

It is an amenable number.

41505521621 is a deficient number, since it is larger than the sum of its proper divisors (13026571).

41505521621 is a wasteful number, since it uses less digits than its factorization.

41505521621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13026570.

The product of its (nonzero) digits is 12000, while the sum is 32.

The spelling of 41505521621 in words is "forty-one billion, five hundred five million, five hundred twenty-one thousand, six hundred twenty-one".