1221426042464 has 24 divisors (see below), whose sum is σ = 2404766909160. Its totient is φ = 610691589376.

The previous prime is 1221426042379. The next prime is 1221426042469. The reversal of 1221426042464 is 4642406241221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221426042469) 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 in 3 ways as a sum of consecutive naturals, for example, 276947 + ... + 1587309.

It is an arithmetic number, because the mean of its divisors is an integer number (100198621215).

Almost surely, 2^{1221426042464} is an apocalyptic number.

It is an amenable number.

1221426042464 is a deficient number, since it is larger than the sum of its proper divisors (1183340866696).

1221426042464 is a wasteful number, since it uses less digits than its factorization.

1221426042464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339502 (or 1339494 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 38.

The spelling of 1221426042464 in words is "one trillion, two hundred twenty-one billion, four hundred twenty-six million, forty-two thousand, four hundred sixty-four".