350555012721 has 6 divisors (see below), whose sum is σ = 506357240610. Its totient is φ = 233703341808.

The previous prime is 350555012659. The next prime is 350555012729. The reversal of 350555012721 is 127210555053.

350555012721 is a `hidden beast` number, since 3 + 505 + 5 + 5 + 0 + 127 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 340402233600 + 10152779121 = 583440^2 + 100761^2 .

It is not a de Polignac number, because 350555012721 - 2¹⁹ = 350554488433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (350555012729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19475278476 + ... + 19475278493.

It is an arithmetic number, because the mean of its divisors is an integer number (84392873435).

Almost surely, 2^350555012721 is an apocalyptic number.

It is an amenable number.

350555012721 is a deficient number, since it is larger than the sum of its proper divisors (155802227889).

350555012721 is a wasteful number, since it uses less digits than its factorization.

350555012721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38950556975 (or 38950556972 counting only the distinct ones).

The product of its (nonzero) digits is 52500, while the sum is 36.

Adding to 350555012721 its reverse (127210555053), we get a palindrome (477765567774).

The spelling of 350555012721 in words is "three hundred fifty billion, five hundred fifty-five million, twelve thousand, seven hundred twenty-one".