40446536921 has 12 divisors (see below), whose sum is σ = 47056009140. Its totient is φ = 34664071680.

The previous prime is 40446536917. The next prime is 40446536947. The reversal of 40446536921 is 12963564404.

It can be written as a sum of positive squares in 2 ways, for example, as 27708931600 + 12737605321 = 166460^2 + 112861^2 .

It is not a de Polignac number, because 40446536921 - 2² = 40446536917 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40446536521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 373901 + ... + 469781.

It is an arithmetic number, because the mean of its divisors is an integer number (3921334095).

Almost surely, 2^40446536921 is an apocalyptic number.

It is an amenable number.

40446536921 is a deficient number, since it is larger than the sum of its proper divisors (6609472219).

40446536921 is an equidigital number, since it uses as much as digits as its factorization.

40446536921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104504 (or 104497 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 40446536921 in words is "forty billion, four hundred forty-six million, five hundred thirty-six thousand, nine hundred twenty-one".