721011 has 8 divisors (see below), whose sum is σ = 968400. Its totient is φ = 477152.

The previous prime is 721003. The next prime is 721013. The reversal of 721011 is 110127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 721011 - 2³ = 721003 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721011.

It is not an unprimeable number, because it can be changed into a prime (721013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360 + ... + 1253.

It is an arithmetic number, because the mean of its divisors is an integer number (121050).

2⁷²¹⁰¹¹ is an apocalyptic number.

721011 is a deficient number, since it is larger than the sum of its proper divisors (247389).

721011 is a wasteful number, since it uses less digits than its factorization.

721011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1765.

The product of its (nonzero) digits is 14, while the sum is 12.

The square root of 721011 is about 849.1236659050. The cubic root of 721011 is about 89.6700262388.

Adding to 721011 its reverse (110127), we get a palindrome (831138).

The spelling of 721011 in words is "seven hundred twenty-one thousand, eleven", and thus it is an iban number.