721123321127 has 16 divisors (see below), whose sum is σ = 812197100544. Its totient is φ = 634309704000.

The previous prime is 721123321111. The next prime is 721123321141.

721123321127 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 721123321127 - 2⁴ = 721123321111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721123321093 and 721123321102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721123321157) 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, 1825628 + ... + 2185214.

It is an arithmetic number, because the mean of its divisors is an integer number (50762318784).

Almost surely, 2^721123321127 is an apocalyptic number.

721123321127 is a deficient number, since it is larger than the sum of its proper divisors (91073779417).

721123321127 is a wasteful number, since it uses less digits than its factorization.

721123321127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365510.

The product of its digits is 7056, while the sum is 32.

The spelling of 721123321127 in words is "seven hundred twenty-one billion, one hundred twenty-three million, three hundred twenty-one thousand, one hundred twenty-seven".