1211403212011 has 4 divisors (see below), whose sum is σ = 1213275551472. Its totient is φ = 1209530872552.

The previous prime is 1211403212009. The next prime is 1211403212017. The reversal of 1211403212011 is 1102123041121.

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

It is a cyclic number.

It is not a de Polignac number, because 1211403212011 - 2¹ = 1211403212009 is a prime.

It is a super-3 number, since 3×1211403212011³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211403212011.

It is not an unprimeable number, because it can be changed into a prime (1211403212017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 936168760 + ... + 936170053.

It is an arithmetic number, because the mean of its divisors is an integer number (303318887868).

Almost surely, 2^{1211403212011} is an apocalyptic number.

1211403212011 is a deficient number, since it is larger than the sum of its proper divisors (1872339461).

1211403212011 is an equidigital number, since it uses as much as digits as its factorization.

1211403212011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1872339460.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1211403212011 its reverse (1102123041121), we get a palindrome (2313526253132).

The spelling of 1211403212011 in words is "one trillion, two hundred eleven billion, four hundred three million, two hundred twelve thousand, eleven".