501455501113221 has 12 divisors (see below), whose sum is σ = 728326406161900. Its totient is φ = 332456685819840.

The previous prime is 501455501113183. The next prime is 501455501113223. The reversal of 501455501113221 is 122311105554105.

501455501113221 is a `hidden beast` number, since 5 + 0 + 1 + 45 + 550 + 1 + 11 + 32 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 122399483364900 + 379056017748321 = 11063430^2 + 19469361^2 .

It is a de Polignac number, because none of the positive numbers 2^k-501455501113221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501455501113223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 153915130696 + ... + 153915133953.

Almost surely, 2^{501455501113221} is an apocalyptic number.

It is an amenable number.

501455501113221 is a deficient number, since it is larger than the sum of its proper divisors (226870905048679).

501455501113221 is a wasteful number, since it uses less digits than its factorization.

501455501113221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307830264836 (or 307830264833 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 36.

Adding to 501455501113221 its reverse (122311105554105), we get a palindrome (623766606667326).

The spelling of 501455501113221 in words is "five hundred one trillion, four hundred fifty-five billion, five hundred one million, one hundred thirteen thousand, two hundred twenty-one".