7221643 has 12 divisors (see below), whose sum is σ = 8550304. Its totient is φ = 6058800.

The previous prime is 7221631. The next prime is 7221649. The reversal of 7221643 is 3461227.

7221643 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7221643 - 2⁵ = 7221611 is a prime.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7221649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 723 + ... + 3868.

Almost surely, 2^7221643 is an apocalyptic number.

7221643 is a deficient number, since it is larger than the sum of its proper divisors (1328661).

7221643 is a wasteful number, since it uses less digits than its factorization.

7221643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4626 (or 4615 counting only the distinct ones).

The product of its digits is 2016, while the sum is 25.

The square root of 7221643 is about 2687.3114817602. The cubic root of 7221643 is about 193.2911656615.

The spelling of 7221643 in words is "seven million, two hundred twenty-one thousand, six hundred forty-three".