1221212100099 has 8 divisors (see below), whose sum is σ = 1628818960720. Its totient is φ = 813873319776.

The previous prime is 1221212100077. The next prime is 1221212100107. The reversal of 1221212100099 is 9900012121221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221212100099 - 2⁸ = 1221212099843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221212100019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67009444 + ... + 67027665.

It is an arithmetic number, because the mean of its divisors is an integer number (203602370090).

Almost surely, 2^{1221212100099} is an apocalyptic number.

1221212100099 is a deficient number, since it is larger than the sum of its proper divisors (407606860621).

1221212100099 is a wasteful number, since it uses less digits than its factorization.

1221212100099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134040149.

The product of its (nonzero) digits is 1296, while the sum is 30.

The spelling of 1221212100099 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, one hundred thousand, ninety-nine".