1111212121111 has 8 divisors (see below), whose sum is σ = 1124517511040. Its totient is φ = 1097944478208.

The previous prime is 1111212121087. The next prime is 1111212121189.

1111212121111 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111212121111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111212121711) 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, 9377526 + ... + 9495283.

It is an arithmetic number, because the mean of its divisors is an integer number (140564688880).

Almost surely, 2^{1111212121111} is an apocalyptic number.

1111212121111 is a deficient number, since it is larger than the sum of its proper divisors (13305389929).

1111212121111 is an equidigital number, since it uses as much as digits as its factorization.

1111212121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18873513.

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

The spelling of 1111212121111 in words is "one trillion, one hundred eleven billion, two hundred twelve million, one hundred twenty-one thousand, one hundred eleven".