12221007826897 has 2 divisors, whose sum is σ = 12221007826898. Its totient is φ = 12221007826896.

The previous prime is 12221007826877. The next prime is 12221007826903. The reversal of 12221007826897 is 79862870012221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8986750879681 + 3234256947216 = 2997791^2 + 1798404^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221007826897 - 2²⁷ = 12220873609169 is a prime.

It is not a weakly prime, because it can be changed into another prime (12221007826877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110503913448 + 6110503913449.

It is an arithmetic number, because the mean of its divisors is an integer number (6110503913449).

Almost surely, 2^{12221007826897} is an apocalyptic number.

It is an amenable number.

12221007826897 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221007826897 is an equidigital number, since it uses as much as digits as its factorization.

12221007826897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2709504, while the sum is 55.

The spelling of 12221007826897 in words is "twelve trillion, two hundred twenty-one billion, seven million, eight hundred twenty-six thousand, eight hundred ninety-seven".