7221310511161 has 2 divisors, whose sum is σ = 7221310511162. Its totient is φ = 7221310511160.

The previous prime is 7221310511141. The next prime is 7221310511197. The reversal of 7221310511161 is 1611150131227.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4264406721936 + 2956903789225 = 2065044^2 + 1719565^2 .

It is a cyclic number.

It is not a de Polignac number, because 7221310511161 - 2¹³ = 7221310502969 is a prime.

It is not a weakly prime, because it can be changed into another prime (7221310511141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3610655255580 + 3610655255581.

It is an arithmetic number, because the mean of its divisors is an integer number (3610655255581).

Almost surely, 2^{7221310511161} is an apocalyptic number.

It is an amenable number.

7221310511161 is a deficient number, since it is larger than the sum of its proper divisors (1).

7221310511161 is an equidigital number, since it uses as much as digits as its factorization.

7221310511161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 31.

Adding to 7221310511161 its reverse (1611150131227), we get a palindrome (8832460642388).

The spelling of 7221310511161 in words is "seven trillion, two hundred twenty-one billion, three hundred ten million, five hundred eleven thousand, one hundred sixty-one".