1201212101111 has 8 divisors (see below), whose sum is σ = 1318259988864. Its totient is φ = 1085472011320.

The previous prime is 1201212101071. The next prime is 1201212101129. The reversal of 1201212101111 is 1111012121021.

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

It is a cyclic number.

It is not a de Polignac number, because 1201212101111 - 2¹⁰ = 1201212100087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201212101191) 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, 326947565 + ... + 326951238.

It is an arithmetic number, because the mean of its divisors is an integer number (164782498608).

Almost surely, 2^{1201212101111} is an apocalyptic number.

1201212101111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1201212101111 is a deficient number, since it is larger than the sum of its proper divisors (117047887753).

1201212101111 is a wasteful number, since it uses less digits than its factorization.

1201212101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653898981.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1201212101111 its reverse (1111012121021), we get a palindrome (2312224222132).

The spelling of 1201212101111 in words is "one trillion, two hundred one billion, two hundred twelve million, one hundred one thousand, one hundred eleven".