7223621 has 8 divisors (see below), whose sum is σ = 7496184. Its totient is φ = 6955200.

The previous prime is 7223609. The next prime is 7223627. The reversal of 7223621 is 1263227.

7223621 = T₁₆₀ + T₁₆₁ + ... + T₃₆₁.

It can be written as a sum of positive squares in 4 ways, for example, as 5152900 + 2070721 = 2270^2 + 1439^2 .

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 7223621 - 2¹⁴ = 7207237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7223627) 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, 2771 + ... + 4703.

It is an arithmetic number, because the mean of its divisors is an integer number (937023).

Almost surely, 2^7223621 is an apocalyptic number.

It is an amenable number.

7223621 is a deficient number, since it is larger than the sum of its proper divisors (272563).

7223621 is a wasteful number, since it uses less digits than its factorization.

7223621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2071.

The product of its digits is 1008, while the sum is 23.

The square root of 7223621 is about 2687.6794823788. The cubic root of 7223621 is about 193.3088114624.

Adding to 7223621 its reverse (1263227), we get a palindrome (8486848).

The spelling of 7223621 in words is "seven million, two hundred twenty-three thousand, six hundred twenty-one".