721042201 has 4 divisors (see below), whose sum is σ = 786591504. Its totient is φ = 655492900.

The previous prime is 721042187. The next prime is 721042211. The reversal of 721042201 is 102240127.

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 721042201 - 2⁵ = 721042169 is a prime.

It is a super-5 number, since 5×721042201⁵ (a number of 45 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721042211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32774635 + ... + 32774656.

It is an arithmetic number, because the mean of its divisors is an integer number (196647876).

Almost surely, 2^721042201 is an apocalyptic number.

It is an amenable number.

721042201 is a deficient number, since it is larger than the sum of its proper divisors (65549303).

721042201 is a wasteful number, since it uses less digits than its factorization.

721042201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65549302.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 721042201 is about 26852.2289763811. The cubic root of 721042201 is about 896.7131967918.

Adding to 721042201 its reverse (102240127), we get a palindrome (823282328).

It can be divided in two parts, 72104 and 2201, that added together give a triangular number (74305 = T₃₈₅).

The spelling of 721042201 in words is "seven hundred twenty-one million, forty-two thousand, two hundred one".