1221300116212 has 48 divisors (see below), whose sum is σ = 2399586944832. Its totient is φ = 539091866880.

The previous prime is 1221300116189. The next prime is 1221300116221. The reversal of 1221300116212 is 2126110031221.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1538313 + ... + 2192944.

It is an arithmetic number, because the mean of its divisors is an integer number (49991394684).

Almost surely, 2^{1221300116212} is an apocalyptic number.

It is an amenable number.

1221300116212 is a deficient number, since it is larger than the sum of its proper divisors (1178286828620).

1221300116212 is a wasteful number, since it uses less digits than its factorization.

1221300116212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3731488 (or 3731486 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 1221300116212 its reverse (2126110031221), we get a palindrome (3347410147433).

The spelling of 1221300116212 in words is "one trillion, two hundred twenty-one billion, three hundred million, one hundred sixteen thousand, two hundred twelve".