1221211202099 has 16 divisors (see below), whose sum is σ = 1407146999808. Its totient is φ = 1038150382752.

The previous prime is 1221211202093. The next prime is 1221211202111. The reversal of 1221211202099 is 9902021121221.

It is not a de Polignac number, because 1221211202099 - 2⁴⁰ = 121699574323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221211202093) 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 15 ways as a sum of consecutive naturals, for example, 2344169 + ... + 2817365.

It is an arithmetic number, because the mean of its divisors is an integer number (87946687488).

Almost surely, 2^{1221211202099} is an apocalyptic number.

1221211202099 is a deficient number, since it is larger than the sum of its proper divisors (185935797709).

1221211202099 is a wasteful number, since it uses less digits than its factorization.

1221211202099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476234.

The product of its (nonzero) digits is 2592, while the sum is 32.

The spelling of 1221211202099 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, two hundred two thousand, ninety-nine".