7071221 has 4 divisors (see below), whose sum is σ = 7235712. Its totient is φ = 6906732.

The previous prime is 7071217. The next prime is 7071227. The reversal of 7071221 is 1221707.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7071221 - 2² = 7071217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7071193 and 7071202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7071227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82181 + ... + 82266.

It is an arithmetic number, because the mean of its divisors is an integer number (1808928).

Almost surely, 2^7071221 is an apocalyptic number.

It is an amenable number.

7071221 is a deficient number, since it is larger than the sum of its proper divisors (164491).

7071221 is a wasteful number, since it uses less digits than its factorization.

7071221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164490.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 7071221 is about 2659.1767523051. The cubic root of 7071221 is about 191.9396964119.

Adding to 7071221 its reverse (1221707), we get a palindrome (8292928).

The spelling of 7071221 in words is "seven million, seventy-one thousand, two hundred twenty-one".