7221641 has 8 divisors (see below), whose sum is σ = 8270784. Its totient is φ = 6176880.

The previous prime is 7221631. The next prime is 7221649. The reversal of 7221641 is 1461227.

7221641 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 7221641 - 2¹⁸ = 6959497 is a prime.

It is a super-3 number, since 3×7221641³ (a number of 22 digits) contains 333 as substring.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4091 + ... + 5583.

It is an arithmetic number, because the mean of its divisors is an integer number (1033848).

Almost surely, 2^7221641 is an apocalyptic number.

It is an amenable number.

7221641 is a deficient number, since it is larger than the sum of its proper divisors (1049143).

7221641 is a wasteful number, since it uses less digits than its factorization.

7221641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2191.

The product of its digits is 672, while the sum is 23.

The square root of 7221641 is about 2687.3111096410. The cubic root of 7221641 is about 193.2911478178.

Adding to 7221641 its reverse (1461227), we get a palindrome (8682868).

The spelling of 7221641 in words is "seven million, two hundred twenty-one thousand, six hundred forty-one".