721233221113 has 2 divisors, whose sum is σ = 721233221114. Its totient is φ = 721233221112.

The previous prime is 721233221029. The next prime is 721233221131. The reversal of 721233221113 is 311122332127.

Together with next prime (721233221131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 428825903104 + 292407318009 = 654848^2 + 540747^2 .

It is an emirp because it is prime and its reverse (311122332127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 721233221113 - 2¹⁷ = 721233090041 is a prime.

It is not a weakly prime, because it can be changed into another prime (721233221143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360616610556 + 360616610557.

It is an arithmetic number, because the mean of its divisors is an integer number (360616610557).

Almost surely, 2^721233221113 is an apocalyptic number.

It is an amenable number.

721233221113 is a deficient number, since it is larger than the sum of its proper divisors (1).

721233221113 is an equidigital number, since it uses as much as digits as its factorization.

721233221113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 28.

The spelling of 721233221113 in words is "seven hundred twenty-one billion, two hundred thirty-three million, two hundred twenty-one thousand, one hundred thirteen".