1211120001009 has 12 divisors (see below), whose sum is σ = 1749939396036. Its totient is φ = 807162331392.

The previous prime is 1211120001001. The next prime is 1211120001097. The reversal of 1211120001009 is 9001000211121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1174995296784 + 36124704225 = 1083972^2 + 190065^2 .

It is not a de Polignac number, because 1211120001009 - 2³ = 1211120001001 is a prime.

It is a super-2 number, since 2×1211120001009² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211120000982 and 1211120001000.

It is not an unprimeable number, because it can be changed into a prime (1211120001001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20886324 + ... + 20944229.

It is an arithmetic number, because the mean of its divisors is an integer number (145828283003).

Almost surely, 2^{1211120001009} is an apocalyptic number.

It is an amenable number.

1211120001009 is a deficient number, since it is larger than the sum of its proper divisors (538819395027).

1211120001009 is a wasteful number, since it uses less digits than its factorization.

1211120001009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41833776 (or 41833773 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The spelling of 1211120001009 in words is "one trillion, two hundred eleven billion, one hundred twenty million, one thousand, nine".