111111001221211 has 4 divisors (see below), whose sum is σ = 111117247290000. Its totient is φ = 111104755152424.

The previous prime is 111111001221197. The next prime is 111111001221223. The reversal of 111111001221211 is 112122100111111.

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 111111001221211 - 2¹³ = 111111001213019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111111001221611) 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, 3123007711 + ... + 3123043288.

It is an arithmetic number, because the mean of its divisors is an integer number (27779311822500).

Almost surely, 2^{111111001221211} is an apocalyptic number.

111111001221211 is a deficient number, since it is larger than the sum of its proper divisors (6246068789).

111111001221211 is an equidigital number, since it uses as much as digits as its factorization.

111111001221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6246068788.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 111111001221211 its reverse (112122100111111), we get a palindrome (223233101332322).

The spelling of 111111001221211 in words is "one hundred eleven trillion, one hundred eleven billion, one million, two hundred twenty-one thousand, two hundred eleven".