1221988004459 has 2 divisors, whose sum is σ = 1221988004460. Its totient is φ = 1221988004458.

The previous prime is 1221988004437. The next prime is 1221988004473. The reversal of 1221988004459 is 9544008891221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221988004459 - 2⁴⁰ = 122476376683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221988004459.

It is not a weakly prime, because it can be changed into another prime (1221988004059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610994002229 + 610994002230.

It is an arithmetic number, because the mean of its divisors is an integer number (610994002230).

Almost surely, 2^{1221988004459} is an apocalyptic number.

1221988004459 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221988004459 is an equidigital number, since it uses as much as digits as its factorization.

1221988004459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1658880, while the sum is 53.

The spelling of 1221988004459 in words is "one trillion, two hundred twenty-one billion, nine hundred eighty-eight million, four thousand, four hundred fifty-nine".