721020112 has 10 divisors (see below), whose sum is σ = 1396976498. Its totient is φ = 360510048.

The previous prime is 721020107. The next prime is 721020163. The reversal of 721020112 is 211020127.

It can be written as a sum of positive squares in only one way, i.e., 658230336 + 62789776 = 25656^2 + 7924^2 .

It is a Harshad number since it is a multiple of its sum of digits (16), and also a Moran number because the ratio is a prime number: 45063757 = 721020112 / (7 + 2 + 1 + 0 + 2 + 0 + 1 + 1 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22531863 + ... + 22531894.

Almost surely, 2^721020112 is an apocalyptic number.

It is an amenable number.

721020112 is a deficient number, since it is larger than the sum of its proper divisors (675956386).

721020112 is a wasteful number, since it uses less digits than its factorization.

721020112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45063765 (or 45063759 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 721020112 is about 26851.8176665938. The cubic root of 721020112 is about 896.7040398151.

Adding to 721020112 its reverse (211020127), we get a palindrome (932040239).

The spelling of 721020112 in words is "seven hundred twenty-one million, twenty thousand, one hundred twelve".