1210121201111 has 4 divisors (see below), whose sum is σ = 1214722422672. Its totient is φ = 1205519979552.

The previous prime is 1210121201099. The next prime is 1210121201117. The reversal of 1210121201111 is 1111021210121.

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 1210121201111 - 2³⁰ = 1209047459287 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 (1210121201117) 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, 2300610386 + ... + 2300610911.

It is an arithmetic number, because the mean of its divisors is an integer number (303680605668).

Almost surely, 2^{1210121201111} is an apocalyptic number.

1210121201111 is a deficient number, since it is larger than the sum of its proper divisors (4601221561).

1210121201111 is an equidigital number, since it uses as much as digits as its factorization.

1210121201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4601221560.

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

Adding to 1210121201111 its reverse (1111021210121), we get a palindrome (2321142411232).

The spelling of 1210121201111 in words is "one trillion, two hundred ten billion, one hundred twenty-one million, two hundred one thousand, one hundred eleven".