1211121012195 has 32 divisors (see below), whose sum is σ = 2153282683200. Its totient is φ = 645877608192.

The previous prime is 1211121012191. The next prime is 1211121012239. The reversal of 1211121012195 is 5912101211121.

It is not a de Polignac number, because 1211121012195 - 2² = 1211121012191 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1211121012191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1288071 + ... + 2020239.

It is an arithmetic number, because the mean of its divisors is an integer number (67290083850).

Almost surely, 2^{1211121012195} is an apocalyptic number.

1211121012195 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1211121012195 is a deficient number, since it is larger than the sum of its proper divisors (942161671005).

1211121012195 is a wasteful number, since it uses less digits than its factorization.

1211121012195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744436 (or 744430 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 27.

The spelling of 1211121012195 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, twelve thousand, one hundred ninety-five".