721111012 has 12 divisors (see below), whose sum is σ = 1282632316. Its totient is φ = 354644640.

The previous prime is 721111007. The next prime is 721111081. The reversal of 721111012 is 210111127.

It can be written as a sum of positive squares in 2 ways, for example, as 112699456 + 608411556 = 10616^2 + 24666^2 .

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, 1477443 + ... + 1477930.

Almost surely, 2^721111012 is an apocalyptic number.

It is an amenable number.

721111012 is a deficient number, since it is larger than the sum of its proper divisors (561521304).

721111012 is a wasteful number, since it uses less digits than its factorization.

721111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2955438 (or 2955436 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 16.

The square root of 721111012 is about 26853.5102360939. The cubic root of 721111012 is about 896.7417211366.

Adding to 721111012 its reverse (210111127), we get a palindrome (931222139).

The spelling of 721111012 in words is "seven hundred twenty-one million, one hundred eleven thousand, twelve".