721427724127 has 16 divisors (see below), whose sum is σ = 790572672000. Its totient is φ = 652876899840.

The previous prime is 721427724091. The next prime is 721427724137.

721427724127 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 721427724127 - 2⁷ = 721427723999 is a prime.

It is a super-2 number, since 2×721427724127² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721427724137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37942399 + ... + 37961407.

It is an arithmetic number, because the mean of its divisors is an integer number (49410792000).

Almost surely, 2^721427724127 is an apocalyptic number.

721427724127 is a deficient number, since it is larger than the sum of its proper divisors (69144947873).

721427724127 is a wasteful number, since it uses less digits than its factorization.

721427724127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34446.

The product of its digits is 614656, while the sum is 46.

The spelling of 721427724127 in words is "seven hundred twenty-one billion, four hundred twenty-seven million, seven hundred twenty-four thousand, one hundred twenty-seven".