111212121212009 has 8 divisors (see below), whose sum is σ = 112747881638952. Its totient is φ = 109676693399040.

The previous prime is 111212121211991. The next prime is 111212121212011. The reversal of 111212121212009 is 900212121212111.

It can be written as a sum of positive squares in 4 ways, for example, as 4624770678784 + 106587350533225 = 2150528^2 + 10324115^2 .

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 111212121212009 - 2⁸ = 111212121211753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111212121212089) 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, 82480124 + ... + 83817629.

It is an arithmetic number, because the mean of its divisors is an integer number (14093485204869).

Almost surely, 2^{111212121212009} is an apocalyptic number.

It is an amenable number.

111212121212009 is a deficient number, since it is larger than the sum of its proper divisors (1535760426943).

111212121212009 is an equidigital number, since it uses as much as digits as its factorization.

111212121212009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166306987.

The product of its (nonzero) digits is 288, while the sum is 26.

The spelling of 111212121212009 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twelve thousand, nine".