7224121 has 2 divisors, whose sum is σ = 7224122. Its totient is φ = 7224120.

The previous prime is 7224109. The next prime is 7224127. The reversal of 7224121 is 1214227.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6948496 + 275625 = 2636^2 + 525^2 .

It is a cyclic number.

It is not a de Polignac number, because 7224121 - 2⁵ = 7224089 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7224127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3612060 + 3612061.

It is an arithmetic number, because the mean of its divisors is an integer number (3612061).

Almost surely, 2^7224121 is an apocalyptic number.

It is an amenable number.

7224121 is a deficient number, since it is larger than the sum of its proper divisors (1).

7224121 is an equidigital number, since it uses as much as digits as its factorization.

7224121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 224, while the sum is 19.

The square root of 7224121 is about 2687.7724978130. The cubic root of 7224121 is about 193.3132714683.

Adding to 7224121 its reverse (1214227), we get a palindrome (8438348).

The spelling of 7224121 in words is "seven million, two hundred twenty-four thousand, one hundred twenty-one".