111212121211201 has 4 divisors (see below), whose sum is σ = 111505556887600. Its totient is φ = 110918685534804.

The previous prime is 111212121211183. The next prime is 111212121211229. The reversal of 111212121211201 is 102112121212111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111212121211201 - 2²¹ = 111212119114049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111212121211241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146717837631 + ... + 146717838388.

It is an arithmetic number, because the mean of its divisors is an integer number (27876389221900).

Almost surely, 2^{111212121211201} is an apocalyptic number.

It is an amenable number.

111212121211201 is a deficient number, since it is larger than the sum of its proper divisors (293435676399).

111212121211201 is an equidigital number, since it uses as much as digits as its factorization.

111212121211201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293435676398.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 111212121211201 its reverse (102112121212111), we get a palindrome (213324242423312).

The spelling of 111212121211201 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred twenty-one million, two hundred eleven thousand, two hundred one".