722016021 has 8 divisors (see below), whose sum is σ = 983170944. Its totient is φ = 471102560.

The previous prime is 722016007. The next prime is 722016073. The reversal of 722016021 is 120610227.

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 722016021 - 2⁵ = 722015989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722016121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2560200 + ... + 2560481.

It is an arithmetic number, because the mean of its divisors is an integer number (122896368).

Almost surely, 2^722016021 is an apocalyptic number.

It is an amenable number.

722016021 is a deficient number, since it is larger than the sum of its proper divisors (261154923).

722016021 is a wasteful number, since it uses less digits than its factorization.

722016021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5120731.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 722016021 is about 26870.3558033756. The cubic root of 722016021 is about 897.1167073470.

Adding to 722016021 its reverse (120610227), we get a palindrome (842626248).

The spelling of 722016021 in words is "seven hundred twenty-two million, sixteen thousand, twenty-one".