721062621321 has 32 divisors (see below), whose sum is σ = 1174268067840. Its totient is φ = 384174080256.

The previous prime is 721062621317. The next prime is 721062621343. The reversal of 721062621321 is 123126260127.

721062621321 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 721062621321 - 2² = 721062621317 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (721062521321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9400041 + ... + 9476438.

It is an arithmetic number, because the mean of its divisors is an integer number (36695877120).

Almost surely, 2^721062621321 is an apocalyptic number.

It is an amenable number.

721062621321 is a deficient number, since it is larger than the sum of its proper divisors (453205446519).

721062621321 is a wasteful number, since it uses less digits than its factorization.

721062621321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18876613.

The product of its (nonzero) digits is 12096, while the sum is 33.

Adding to 721062621321 its reverse (123126260127), we get a palindrome (844188881448).

The spelling of 721062621321 in words is "seven hundred twenty-one billion, sixty-two million, six hundred twenty-one thousand, three hundred twenty-one".