1211121200105 has 16 divisors (see below), whose sum is σ = 1455787365120. Its totient is φ = 967269794688.

The previous prime is 1211121200089. The next prime is 1211121200117. The reversal of 1211121200105 is 5010021211121.

It is a cyclic number.

It is not a de Polignac number, because 1211121200105 - 2⁴ = 1211121200089 is a prime.

It is a super-2 number, since 2×1211121200105² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12869954 + ... + 12963716.

It is an arithmetic number, because the mean of its divisors is an integer number (90986710320).

Almost surely, 2^{1211121200105} is an apocalyptic number.

It is an amenable number.

1211121200105 is a deficient number, since it is larger than the sum of its proper divisors (244666165015).

1211121200105 is an equidigital number, since it uses as much as digits as its factorization.

1211121200105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98080.

The product of its (nonzero) digits is 40, while the sum is 17.

Adding to 1211121200105 its reverse (5010021211121), we get a palindrome (6221142411226).

The spelling of 1211121200105 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, two hundred thousand, one hundred five".