721223201 has 4 divisors (see below), whose sum is σ = 728225472. Its totient is φ = 714220932.

The previous prime is 721223197. The next prime is 721223267. The reversal of 721223201 is 102322127.

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, and also an emirpimes, since its reverse is a distinct semiprime: 102322127 = 1667 ⋅61381.

It is a cyclic number.

It is not a de Polignac number, because 721223201 - 2² = 721223197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721223281) 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, 3500981 + ... + 3501186.

It is an arithmetic number, because the mean of its divisors is an integer number (182056368).

Almost surely, 2^721223201 is an apocalyptic number.

It is an amenable number.

721223201 is a deficient number, since it is larger than the sum of its proper divisors (7002271).

721223201 is a wasteful number, since it uses less digits than its factorization.

721223201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7002270.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 721223201 is about 26855.5990623929. The cubic root of 721223201 is about 896.7882231492.

Adding to 721223201 its reverse (102322127), we get a palindrome (823545328).

The spelling of 721223201 in words is "seven hundred twenty-one million, two hundred twenty-three thousand, two hundred one".