7221811 has 2 divisors, whose sum is σ = 7221812. Its totient is φ = 7221810.

The previous prime is 7221779. The next prime is 7221829. The reversal of 7221811 is 1181227.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7221811 - 2⁵ = 7221779 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7221871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3610905 + 3610906.

It is an arithmetic number, because the mean of its divisors is an integer number (3610906).

Almost surely, 2^7221811 is an apocalyptic number.

7221811 is a deficient number, since it is larger than the sum of its proper divisors (1).

7221811 is an equidigital number, since it uses as much as digits as its factorization.

7221811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 224, while the sum is 22.

The square root of 7221811 is about 2687.3427395850. The cubic root of 7221811 is about 193.2926645201.

The spelling of 7221811 in words is "seven million, two hundred twenty-one thousand, eight hundred eleven".