12221215927777 has 2 divisors, whose sum is σ = 12221215927778. Its totient is φ = 12221215927776.

The previous prime is 12221215927763. The next prime is 12221215927801. The reversal of 12221215927777 is 77772951212221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8826627089296 + 3394588838481 = 2970964^2 + 1842441^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221215927777 is a prime.

It is not a weakly prime, because it can be changed into another prime (12221215927717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110607963888 + 6110607963889.

It is an arithmetic number, because the mean of its divisors is an integer number (6110607963889).

Almost surely, 2^{12221215927777} is an apocalyptic number.

It is an amenable number.

12221215927777 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221215927777 is an equidigital number, since it uses as much as digits as its factorization.

12221215927777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3457440, while the sum is 55.

The spelling of 12221215927777 in words is "twelve trillion, two hundred twenty-one billion, two hundred fifteen million, nine hundred twenty-seven thousand, seven hundred seventy-seven".