721233332101 has 4 divisors (see below), whose sum is σ = 721971545292. Its totient is φ = 720495118912.

The previous prime is 721233332089. The next prime is 721233332123. The reversal of 721233332101 is 101233332127.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 554728529601 + 166504802500 = 744801^2 + 408050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721233332101 is a prime.

It is a super-2 number, since 2×721233332101² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 721233332101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721233330101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 369105130 + ... + 369107083.

It is an arithmetic number, because the mean of its divisors is an integer number (180492886323).

Almost surely, 2^721233332101 is an apocalyptic number.

It is an amenable number.

721233332101 is a deficient number, since it is larger than the sum of its proper divisors (738213191).

721233332101 is an equidigital number, since it uses as much as digits as its factorization.

721233332101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738213190.

The product of its (nonzero) digits is 4536, while the sum is 28.

Adding to 721233332101 its reverse (101233332127), we get a palindrome (822466664228).

The spelling of 721233332101 in words is "seven hundred twenty-one billion, two hundred thirty-three million, three hundred thirty-two thousand, one hundred one".