1211120120005 has 4 divisors (see below), whose sum is σ = 1453344144012. Its totient is φ = 968896096000.

The previous prime is 1211120119987. The next prime is 1211120120053. The reversal of 1211120120005 is 5000210211121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 272318029281 + 938802090724 = 521841^2 + 968918^2 .

It is not a de Polignac number, because 1211120120005 - 2¹⁷ = 1211119988933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121112011996 + ... + 121112012005.

It is an arithmetic number, because the mean of its divisors is an integer number (363336036003).

Almost surely, 2^{1211120120005} is an apocalyptic number.

It is an amenable number.

1211120120005 is a deficient number, since it is larger than the sum of its proper divisors (242224024007).

1211120120005 is an equidigital number, since it uses as much as digits as its factorization.

1211120120005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242224024006.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 1211120120005 its reverse (5000210211121), we get a palindrome (6211330331126).

The spelling of 1211120120005 in words is "one trillion, two hundred eleven billion, one hundred twenty million, one hundred twenty thousand, five".