1221211100116 has 12 divisors (see below), whose sum is σ = 2442422200288. Its totient is φ = 523376185752.

The previous prime is 1221211100107. The next prime is 1221211100117. The reversal of 1221211100116 is 6110011121221.

1221211100116 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 1221211100093 and 1221211100102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221211100117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21807341046 + ... + 21807341101.

Almost surely, 2^{1221211100116} is an apocalyptic number.

It is an amenable number.

1221211100116 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221211100116 is a wasteful number, since it uses less digits than its factorization.

1221211100116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43614682158 (or 43614682156 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 1221211100116 its reverse (6110011121221), we get a palindrome (7331222221337).

The spelling of 1221211100116 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, one hundred thousand, one hundred sixteen".