1211100012105 has 8 divisors (see below), whose sum is σ = 1937760019392. Its totient is φ = 645920006448.

The previous prime is 1211100012097. The next prime is 1211100012121. The reversal of 1211100012105 is 5012100011121.

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

It is not a de Polignac number, because 1211100012105 - 2³ = 1211100012097 is a prime.

It is a super-2 number, since 2×1211100012105² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 80740000807 = 1211100012105 / (1 + 2 + 1 + 1 + 1 + 0 + 0 + 0 + 1 + 2 + 1 + 0 + 5).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40370000389 + ... + 40370000418.

It is an arithmetic number, because the mean of its divisors is an integer number (242220002424).

Almost surely, 2^{1211100012105} is an apocalyptic number.

1211100012105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211100012105 is a deficient number, since it is larger than the sum of its proper divisors (726660007287).

1211100012105 is an equidigital number, since it uses as much as digits as its factorization.

1211100012105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80740000815.

The product of its (nonzero) digits is 20, while the sum is 15.

Adding to 1211100012105 its reverse (5012100011121), we get a palindrome (6223200023226).

The spelling of 1211100012105 in words is "one trillion, two hundred eleven billion, one hundred million, twelve thousand, one hundred five".