721053440105121 has 24 divisors (see below), whose sum is σ = 1043784346812480. Its totient is φ = 479659087548000.

The previous prime is 721053440105039. The next prime is 721053440105149. The reversal of 721053440105121 is 121501044350127.

721053440105121 is a `hidden beast` number, since 7 + 2 + 1 + 0 + 534 + 4 + 0 + 105 + 12 + 1 = 666.

721053440105121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 721053440105121 - 2¹⁰ = 721053440104097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721053440115121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39053955 + ... + 54473096.

It is an arithmetic number, because the mean of its divisors is an integer number (43491014450520).

Almost surely, 2^{721053440105121} is an apocalyptic number.

It is an amenable number.

721053440105121 is a deficient number, since it is larger than the sum of its proper divisors (322730906707359).

721053440105121 is a wasteful number, since it uses less digits than its factorization.

721053440105121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93528917 (or 93528914 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

Adding to 721053440105121 its reverse (121501044350127), we get a palindrome (842554484455248).

The spelling of 721053440105121 in words is "seven hundred twenty-one trillion, fifty-three billion, four hundred forty million, one hundred five thousand, one hundred twenty-one".