721219851 has 12 divisors (see below), whose sum is σ = 1136467800. Its totient is φ = 437102880.

The previous prime is 721219843. The next prime is 721219853. The reversal of 721219851 is 158912127.

It is a happy number.

It is not a de Polignac number, because 721219851 - 2³ = 721219843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721219853) 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 11 ways as a sum of consecutive naturals, for example, 3642426 + ... + 3642623.

It is an arithmetic number, because the mean of its divisors is an integer number (94705650).

Almost surely, 2^721219851 is an apocalyptic number.

721219851 is a deficient number, since it is larger than the sum of its proper divisors (415247949).

721219851 is a wasteful number, since it uses less digits than its factorization.

721219851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7285066 (or 7285063 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 721219851 is about 26855.5366917141. The cubic root of 721219851 is about 896.7868346539.

The spelling of 721219851 in words is "seven hundred twenty-one million, two hundred nineteen thousand, eight hundred fifty-one".