7221217667 has 2 divisors, whose sum is σ = 7221217668. Its totient is φ = 7221217666.

The previous prime is 7221217649. The next prime is 7221217681. The reversal of 7221217667 is 7667121227.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7221217667 - 2¹⁸ = 7220955523 is a prime.

It is not a weakly prime, because it can be changed into another prime (7221217067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3610608833 + 3610608834.

It is an arithmetic number, because the mean of its divisors is an integer number (3610608834).

Almost surely, 2^7221217667 is an apocalyptic number.

7221217667 is a deficient number, since it is larger than the sum of its proper divisors (1).

7221217667 is an equidigital number, since it uses as much as digits as its factorization.

7221217667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 41.

The square root of 7221217667 is about 84977.7480697153. The cubic root of 7221217667 is about 1932.8737083137.

The spelling of 7221217667 in words is "seven billion, two hundred twenty-one million, two hundred seventeen thousand, six hundred sixty-seven".