2221684445249 has 2 divisors, whose sum is σ = 2221684445250. Its totient is φ = 2221684445248.

The previous prime is 2221684445231. The next prime is 2221684445327. The reversal of 2221684445249 is 9425444861222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1150324891024 + 1071359554225 = 1072532^2 + 1035065^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221684445249 - 2¹² = 2221684441153 is a prime.

It is a super-2 number, since 2×2221684445249² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2221684445249.

It is not a weakly prime, because it can be changed into another prime (2221684444249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110842222624 + 1110842222625.

It is an arithmetic number, because the mean of its divisors is an integer number (1110842222625).

Almost surely, 2^{2221684445249} is an apocalyptic number.

It is an amenable number.

2221684445249 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221684445249 is an equidigital number, since it uses as much as digits as its factorization.

2221684445249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8847360, while the sum is 53.

The spelling of 2221684445249 in words is "two trillion, two hundred twenty-one billion, six hundred eighty-four million, four hundred forty-five thousand, two hundred forty-nine".