721431243386 has 16 divisors (see below), whose sum is σ = 1236803142336. Its totient is φ = 309168851616.

The previous prime is 721431243349. The next prime is 721431243389. The reversal of 721431243386 is 683342134127.

It is not an unprimeable number, because it can be changed into a prime (721431243389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1047731 + ... + 1593926.

It is an arithmetic number, because the mean of its divisors is an integer number (77300196396).

Almost surely, 2^721431243386 is an apocalyptic number.

721431243386 is a deficient number, since it is larger than the sum of its proper divisors (515371898950).

721431243386 is a wasteful number, since it uses less digits than its factorization.

721431243386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2661173.

The product of its digits is 580608, while the sum is 44.

The spelling of 721431243386 in words is "seven hundred twenty-one billion, four hundred thirty-one million, two hundred forty-three thousand, three hundred eighty-six".