7136221 has 2 divisors, whose sum is σ = 7136222. Its totient is φ = 7136220.

The previous prime is 7136203. The next prime is 7136249. The reversal of 7136221 is 1226317.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4056196 + 3080025 = 2014^2 + 1755^2 .

It is a cyclic number.

It is not a de Polignac number, because 7136221 - 2¹⁹ = 6611933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7136192 and 7136201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7136201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3568110 + 3568111.

It is an arithmetic number, because the mean of its divisors is an integer number (3568111).

Almost surely, 2^7136221 is an apocalyptic number.

It is an amenable number.

7136221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7136221 is an equidigital number, since it uses as much as digits as its factorization.

7136221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 22.

The square root of 7136221 is about 2671.3706219842. The cubic root of 7136221 is about 192.5260188589.

The spelling of 7136221 in words is "seven million, one hundred thirty-six thousand, two hundred twenty-one".