721670201 has 16 divisors (see below), whose sum is σ = 831063168. Its totient is φ = 613872000.

The previous prime is 721670171. The next prime is 721670219. The reversal of 721670201 is 102076127.

It is not a de Polignac number, because 721670201 - 2⁶ = 721670137 is a prime.

It is a super-2 number, since 2×721670201² = 1041615758022760802, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (721670231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 686126 + ... + 687176.

It is an arithmetic number, because the mean of its divisors is an integer number (51941448).

Almost surely, 2^721670201 is an apocalyptic number.

It is an amenable number.

721670201 is a deficient number, since it is larger than the sum of its proper divisors (109392967).

721670201 is a wasteful number, since it uses less digits than its factorization.

721670201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1712.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 721670201 is about 26863.9200601848. The cubic root of 721670201 is about 896.9734554730.

The spelling of 721670201 in words is "seven hundred twenty-one million, six hundred seventy thousand, two hundred one".