7115221 has 2 divisors, whose sum is σ = 7115222. Its totient is φ = 7115220.

The previous prime is 7115219. The next prime is 7115233. The reversal of 7115221 is 1225117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7102225 + 12996 = 2665^2 + 114^2 .

It is an emirp because it is prime and its reverse (1225117) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7115221 - 2¹ = 7115219 is a prime.

Together with 7115219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7115281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3557610 + 3557611.

It is an arithmetic number, because the mean of its divisors is an integer number (3557611).

Almost surely, 2^7115221 is an apocalyptic number.

It is an amenable number.

7115221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7115221 is an equidigital number, since it uses as much as digits as its factorization.

7115221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 140, while the sum is 19.

The square root of 7115221 is about 2667.4371595222. The cubic root of 7115221 is about 192.3369823571.

The spelling of 7115221 in words is "seven million, one hundred fifteen thousand, two hundred twenty-one".