721222112011201 has 4 divisors (see below), whose sum is σ = 721543655531952. Its totient is φ = 720900568490452.

The previous prime is 721222112011171. The next prime is 721222112011241. The reversal of 721222112011201 is 102110211222127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 721222112011201 - 2¹⁹ = 721222111486913 is a prime.

It is a super-2 number, since 2×721222112011201² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721222112011241) 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, 160771757011 + ... + 160771761496.

It is an arithmetic number, because the mean of its divisors is an integer number (180385913882988).

Almost surely, 2^{721222112011201} is an apocalyptic number.

It is an amenable number.

721222112011201 is a deficient number, since it is larger than the sum of its proper divisors (321543520751).

721222112011201 is a wasteful number, since it uses less digits than its factorization.

721222112011201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321543520750.

The product of its (nonzero) digits is 448, while the sum is 25.

Adding to 721222112011201 its reverse (102110211222127), we get a palindrome (823332323233328).

The spelling of 721222112011201 in words is "seven hundred twenty-one trillion, two hundred twenty-two billion, one hundred twelve million, eleven thousand, two hundred one".