1211107099 has 4 divisors (see below), whose sum is σ = 1212218280. Its totient is φ = 1209995920.

The previous prime is 1211107069. The next prime is 1211107109. The reversal of 1211107099 is 9907011121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9907011121 = 7 ⋅1415287303.

It is a cyclic number.

It is not a de Polignac number, because 1211107099 - 2⁹ = 1211106587 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211107099.

It is not an unprimeable number, because it can be changed into a prime (1211107049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553954 + ... + 556135.

It is an arithmetic number, because the mean of its divisors is an integer number (303054570).

Almost surely, 2^1211107099 is an apocalyptic number.

1211107099 is a deficient number, since it is larger than the sum of its proper divisors (1111181).

1211107099 is a wasteful number, since it uses less digits than its factorization.

1211107099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111180.

The product of its (nonzero) digits is 1134, while the sum is 31.

The square root of 1211107099 is about 34800.9640527385. The cubic root of 1211107099 is about 1065.9271314094.

The spelling of 1211107099 in words is "one billion, two hundred eleven million, one hundred seven thousand, ninety-nine".