1221230310149 has 2 divisors, whose sum is σ = 1221230310150. Its totient is φ = 1221230310148.

The previous prime is 1221230310143. The next prime is 1221230310229. The reversal of 1221230310149 is 9410130321221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1082702680900 + 138527629249 = 1040530^2 + 372193^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221230310149 - 2¹² = 1221230306053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221230310143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610615155074 + 610615155075.

It is an arithmetic number, because the mean of its divisors is an integer number (610615155075).

Almost surely, 2^{1221230310149} is an apocalyptic number.

It is an amenable number.

1221230310149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221230310149 is an equidigital number, since it uses as much as digits as its factorization.

1221230310149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 1221230310149 in words is "one trillion, two hundred twenty-one billion, two hundred thirty million, three hundred ten thousand, one hundred forty-nine".