1210111212109 has 8 divisors (see below), whose sum is σ = 1286610802488. Its totient is φ = 1134202352640.

The previous prime is 1210111212097. The next prime is 1210111212151. The reversal of 1210111212109 is 9012121110121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 797086483209 + 413024728900 = 892797^2 + 642670^2 .

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 1210111212109 - 2¹⁷ = 1210111081037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1210111212109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210111212209) 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, 147678502 + ... + 147686695.

It is an arithmetic number, because the mean of its divisors is an integer number (160826350311).

Almost surely, 2^{1210111212109} is an apocalyptic number.

It is an amenable number.

1210111212109 is a deficient number, since it is larger than the sum of its proper divisors (76499590379).

1210111212109 is a wasteful number, since it uses less digits than its factorization.

1210111212109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295365455.

The product of its (nonzero) digits is 72, while the sum is 22.

The spelling of 1210111212109 in words is "one trillion, two hundred ten billion, one hundred eleven million, two hundred twelve thousand, one hundred nine".