1221127600916 has 48 divisors (see below), whose sum is σ = 2292562621440. Its totient is φ = 567066339840.

The previous prime is 1221127600801. The next prime is 1221127600939. The reversal of 1221127600916 is 6190067211221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221127600916.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 9990266 + ... + 10111758.

It is an arithmetic number, because the mean of its divisors is an integer number (47761721280).

Almost surely, 2^{1221127600916} is an apocalyptic number.

It is an amenable number.

1221127600916 is a deficient number, since it is larger than the sum of its proper divisors (1071435020524).

1221127600916 is a wasteful number, since it uses less digits than its factorization.

1221127600916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123464 (or 123462 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The spelling of 1221127600916 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-seven million, six hundred thousand, nine hundred sixteen".