1210111212121 has 8 divisors (see below), whose sum is σ = 1383376161920. Its totient is φ = 1036944242208.

The previous prime is 1210111212097. The next prime is 1210111212151. The reversal of 1210111212121 is 1212121110121.

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

It is not a de Polignac number, because 1210111212121 - 2¹⁵ = 1210111179353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210111212095 and 1210111212104.

It is not an unprimeable number, because it can be changed into a prime (1210111212151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24468501 + ... + 24517906.

It is an arithmetic number, because the mean of its divisors is an integer number (172922020240).

Almost surely, 2^{1210111212121} is an apocalyptic number.

It is an amenable number.

1210111212121 is a deficient number, since it is larger than the sum of its proper divisors (173264949799).

1210111212121 is an equidigital number, since it uses as much as digits as its factorization.

1210111212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48989943.

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

Adding to 1210111212121 its reverse (1212121110121), we get a palindrome (2422232322242).

The spelling of 1210111212121 in words is "one trillion, two hundred ten billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty-one".