721100101055 has 4 divisors (see below), whose sum is σ = 865320121272. Its totient is φ = 576880080840.

The previous prime is 721100101039. The next prime is 721100101069. The reversal of 721100101055 is 550101001127.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 721100101055 - 2⁴ = 721100101039 is a prime.

It is a super-2 number, since 2×721100101055² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 721100101055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72110010101 + ... + 72110010110.

It is an arithmetic number, because the mean of its divisors is an integer number (216330030318).

Almost surely, 2^721100101055 is an apocalyptic number.

721100101055 is a deficient number, since it is larger than the sum of its proper divisors (144220020217).

721100101055 is a wasteful number, since it uses less digits than its factorization.

721100101055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144220020216.

The product of its (nonzero) digits is 350, while the sum is 23.

The spelling of 721100101055 in words is "seven hundred twenty-one billion, one hundred million, one hundred one thousand, fifty-five".