721100201 has 4 divisors (see below), whose sum is σ = 721327572. Its totient is φ = 720872832.

The previous prime is 721100189. The next prime is 721100221. The reversal of 721100201 is 102001127.

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 681157801 + 39942400 = 26099^2 + 6320^2 .

It is a cyclic number.

It is not a de Polignac number, because 721100201 - 2¹⁰ = 721099177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721100221) 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, 108860 + ... + 115293.

It is an arithmetic number, because the mean of its divisors is an integer number (180331893).

Almost surely, 2^721100201 is an apocalyptic number.

It is an amenable number.

721100201 is a deficient number, since it is larger than the sum of its proper divisors (227371).

721100201 is a wasteful number, since it uses less digits than its factorization.

721100201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227370.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 721100201 is about 26853.3089394957. The cubic root of 721100201 is about 896.7372397540.

Adding to 721100201 its reverse (102001127), we get a palindrome (823101328).

The spelling of 721100201 in words is "seven hundred twenty-one million, one hundred thousand, two hundred one".