1211100221099 has 4 divisors (see below), whose sum is σ = 1211200266264. Its totient is φ = 1211000175936.

The previous prime is 1211100221083. The next prime is 1211100221113. The reversal of 1211100221099 is 9901220011121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1211100221099 - 2⁴ = 1211100221083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211100221029) 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, 50004422 + ... + 50028635.

It is an arithmetic number, because the mean of its divisors is an integer number (302800066566).

Almost surely, 2^{1211100221099} is an apocalyptic number.

1211100221099 is a deficient number, since it is larger than the sum of its proper divisors (100045165).

1211100221099 is a wasteful number, since it uses less digits than its factorization.

1211100221099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100045164.

The product of its (nonzero) digits is 648, while the sum is 29.

It can be divided in two parts, 121110022 and 1099, that added together give a palindrome (121111121).

The spelling of 1211100221099 in words is "one trillion, two hundred eleven billion, one hundred million, two hundred twenty-one thousand, ninety-nine".