1201220211111 has 8 divisors (see below), whose sum is σ = 1601967521280. Its totient is φ = 800643187512.

The previous prime is 1201220211083. The next prime is 1201220211127. The reversal of 1201220211111 is 1111120221021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1201220211111 - 2⁶ = 1201220211047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201220211911) 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 7 ways as a sum of consecutive naturals, for example, 42555181 + ... + 42583398.

It is an arithmetic number, because the mean of its divisors is an integer number (200245940160).

Almost surely, 2^{1201220211111} is an apocalyptic number.

1201220211111 is a deficient number, since it is larger than the sum of its proper divisors (400747310169).

1201220211111 is an equidigital number, since it uses as much as digits as its factorization.

1201220211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85143285.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1201220211111 its reverse (1111120221021), we get a palindrome (2312340432132).

The spelling of 1201220211111 in words is "one trillion, two hundred one billion, two hundred twenty million, two hundred eleven thousand, one hundred eleven".