12221648543978 has 16 divisors (see below), whose sum is σ = 18351859042944. Its totient is φ = 6104362622400.

The previous prime is 12221648543977. The next prime is 12221648543989. The reversal of 12221648543978 is 87934584612221.

It is a self number, because there is not a number n which added to its sum of digits gives 12221648543978.

It is not an unprimeable number, because it can be changed into a prime (12221648543977) 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 7 ways as a sum of consecutive naturals, for example, 69096953 + ... + 69273603.

It is an arithmetic number, because the mean of its divisors is an integer number (1146991190184).

Almost surely, 2^{12221648543978} is an apocalyptic number.

12221648543978 is a deficient number, since it is larger than the sum of its proper divisors (6130210498966).

12221648543978 is a wasteful number, since it uses less digits than its factorization.

12221648543978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213037.

The product of its digits is 46448640, while the sum is 62.

The spelling of 12221648543978 in words is "twelve trillion, two hundred twenty-one billion, six hundred forty-eight million, five hundred forty-three thousand, nine hundred seventy-eight".