1211320012113 has 12 divisors (see below), whose sum is σ = 1759798247220. Its totient is φ = 802878773856.

The previous prime is 1211320012039. The next prime is 1211320012127. The reversal of 1211320012113 is 3112100231121.

1211320012113 is a `hidden beast` number, since 1 + 211 + 320 + 0 + 121 + 13 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1028463713424 + 182856298689 = 1014132^2 + 427617^2 .

It is not a de Polignac number, because 1211320012113 - 2¹⁷ = 1211319881041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211320012183) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 388990098 + ... + 388993211.

It is an arithmetic number, because the mean of its divisors is an integer number (146649853935).

Almost surely, 2^{1211320012113} is an apocalyptic number.

It is an amenable number.

1211320012113 is a deficient number, since it is larger than the sum of its proper divisors (548478235107).

1211320012113 is a wasteful number, since it uses less digits than its factorization.

1211320012113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777983488 (or 777983485 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 1211320012113 its reverse (3112100231121), we get a palindrome (4323420243234).

The spelling of 1211320012113 in words is "one trillion, two hundred eleven billion, three hundred twenty million, twelve thousand, one hundred thirteen".