722421 has 12 divisors (see below), whose sum is σ = 1192672. Its totient is φ = 412776.

The previous prime is 722417. The next prime is 722431. The reversal of 722421 is 124227.

It is not a de Polignac number, because 722421 - 2² = 722417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 722394 and 722403.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 722421.

It is not an unprimeable number, because it can be changed into a prime (722411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5671 + ... + 5796.

2⁷²²⁴²¹ is an apocalyptic number.

It is an amenable number.

722421 is a deficient number, since it is larger than the sum of its proper divisors (470251).

722421 is a wasteful number, since it uses less digits than its factorization.

722421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11480 (or 11477 counting only the distinct ones).

The product of its digits is 224, while the sum is 18.

The square root of 722421 is about 849.9535281414. The cubic root of 722421 is about 89.7284407006.

Adding to 722421 its reverse (124227), we get a palindrome (846648).

The spelling of 722421 in words is "seven hundred twenty-two thousand, four hundred twenty-one", and thus it is an iban number.