1221219882049 has 2 divisors, whose sum is σ = 1221219882050. Its totient is φ = 1221219882048.

The previous prime is 1221219882013. The next prime is 1221219882079. The reversal of 1221219882049 is 9402889121221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1194124417600 + 27095464449 = 1092760^2 + 164607^2 .

It is an emirp because it is prime and its reverse (9402889121221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221219882049 - 2²⁵ = 1221186327617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221219881993 and 1221219882011.

It is not a weakly prime, because it can be changed into another prime (1221219882079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610609941024 + 610609941025.

It is an arithmetic number, because the mean of its divisors is an integer number (610609941025).

Almost surely, 2^{1221219882049} is an apocalyptic number.

It is an amenable number.

1221219882049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221219882049 is an equidigital number, since it uses as much as digits as its factorization.

1221219882049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 331776, while the sum is 49.

The spelling of 1221219882049 in words is "one trillion, two hundred twenty-one billion, two hundred nineteen million, eight hundred eighty-two thousand, forty-nine".