727023503021 has 4 divisors (see below), whose sum is σ = 769789591452. Its totient is φ = 684257414592.

The previous prime is 727023502991. The next prime is 727023503033. The reversal of 727023503021 is 120305320727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120305320727 = 71 ⋅1694441137.

It can be written as a sum of positive squares in 2 ways, for example, as 233278374121 + 493745128900 = 482989^2 + 702670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-727023503021 is a prime.

It is a super-2 number, since 2×727023503021² (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 (727023523021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21383044190 + ... + 21383044223.

It is an arithmetic number, because the mean of its divisors is an integer number (192447397863).

Almost surely, 2^727023503021 is an apocalyptic number.

It is an amenable number.

727023503021 is a deficient number, since it is larger than the sum of its proper divisors (42766088431).

727023503021 is a wasteful number, since it uses less digits than its factorization.

727023503021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42766088430.

The product of its (nonzero) digits is 17640, while the sum is 32.

Adding to 727023503021 its reverse (120305320727), we get a palindrome (847328823748).

The spelling of 727023503021 in words is "seven hundred twenty-seven billion, twenty-three million, five hundred three thousand, twenty-one".