1221222116949 has 16 divisors (see below), whose sum is σ = 1691997888000. Its totient is φ = 782548998336.

The previous prime is 1221222116909. The next prime is 1221222116953. The reversal of 1221222116949 is 9496112221221.

It is not a de Polignac number, because 1221222116949 - 2²⁰ = 1221221068373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221222116949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221222116909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31453774 + ... + 31492575.

It is an arithmetic number, because the mean of its divisors is an integer number (105749868000).

Almost surely, 2^{1221222116949} is an apocalyptic number.

It is an amenable number.

1221222116949 is a deficient number, since it is larger than the sum of its proper divisors (470775771051).

1221222116949 is a wasteful number, since it uses less digits than its factorization.

1221222116949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62946604.

The product of its digits is 62208, while the sum is 42.

The spelling of 1221222116949 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred sixteen thousand, nine hundred forty-nine".