721225612 has 12 divisors (see below), whose sum is σ = 1336388760. Its totient is φ = 339400256.

The previous prime is 721225607. The next prime is 721225639. The reversal of 721225612 is 216522127.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5303062 + ... + 5303197.

It is an arithmetic number, because the mean of its divisors is an integer number (111365730).

Almost surely, 2^721225612 is an apocalyptic number.

It is an amenable number.

721225612 is a deficient number, since it is larger than the sum of its proper divisors (615163148).

721225612 is a wasteful number, since it uses less digits than its factorization.

721225612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10606280 (or 10606278 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 721225612 is about 26855.6439505740. The cubic root of 721225612 is about 896.7892224488.

Adding to 721225612 its reverse (216522127), we get a palindrome (937747739).

The spelling of 721225612 in words is "seven hundred twenty-one million, two hundred twenty-five thousand, six hundred twelve".