1111211212201 has 4 divisors (see below), whose sum is σ = 1111454850004. Its totient is φ = 1110967574400.

The previous prime is 1111211212183. The next prime is 1111211212229. The reversal of 1111211212201 is 1022121121111.

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 311474493801 + 799736718400 = 558099^2 + 894280^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111211212201 - 2²³ = 1111202823593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1111211219201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121812060 + ... + 121821181.

It is an arithmetic number, because the mean of its divisors is an integer number (277863712501).

Almost surely, 2^{1111211212201} is an apocalyptic number.

It is an amenable number.

1111211212201 is a deficient number, since it is larger than the sum of its proper divisors (243637803).

1111211212201 is an equidigital number, since it uses as much as digits as its factorization.

1111211212201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243637802.

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

Adding to 1111211212201 its reverse (1022121121111), we get a palindrome (2133332333312).

The spelling of 1111211212201 in words is "one trillion, one hundred eleven billion, two hundred eleven million, two hundred twelve thousand, two hundred one".