41856658921 has 27 divisors (see below), whose sum is σ = 53539349367. Its totient is φ = 32603303040.

The previous prime is 41856658873. The next prime is 41856658927. The reversal of 41856658921 is 12985665814.

The square root of 41856658921 is 204589.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 27279477225 + 14577181696 = 165165^2 + 120736^2 .

It is not a de Polignac number, because 41856658921 - 2³¹ = 39709175273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (41856658927) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 15752025 + ... + 15754681.

Almost surely, 2^41856658921 is an apocalyptic number.

41856658921 is the 204589-th square number.

41856658921 is the 102295-th centered octagonal number.

It is an amenable number.

41856658921 is a deficient number, since it is larger than the sum of its proper divisors (11682690446).

41856658921 is an frugal number, since it uses more digits than its factorization.

41856658921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5350 (or 2675 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 55.

The spelling of 41856658921 in words is "forty-one billion, eight hundred fifty-six million, six hundred fifty-eight thousand, nine hundred twenty-one".