1210201211111 has 4 divisors (see below), whose sum is σ = 1210282880424. Its totient is φ = 1210119541800.

The previous prime is 1210201211101. The next prime is 1210201211119. The reversal of 1210201211111 is 1111121020121.

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 1210201211111 - 2¹⁰ = 1210201210087 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 (1210201211119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40812425 + ... + 40842066.

It is an arithmetic number, because the mean of its divisors is an integer number (302570720106).

Almost surely, 2^{1210201211111} is an apocalyptic number.

1210201211111 is a deficient number, since it is larger than the sum of its proper divisors (81669313).

1210201211111 is an equidigital number, since it uses as much as digits as its factorization.

1210201211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81669312.

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

Adding to 1210201211111 its reverse (1111121020121), we get a palindrome (2321322231232).

It can be divided in two parts, 121020121 and 1111, that multiplied together give a palindrome (134453354431).

The spelling of 1210201211111 in words is "one trillion, two hundred ten billion, two hundred one million, two hundred eleven thousand, one hundred eleven".