11221211111 has 8 divisors (see below), whose sum is σ = 12337711104. Its totient is φ = 10120776120.

The previous prime is 11221211107. The next prime is 11221211137. The reversal of 11221211111 is 11111212211.

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 11221211111 - 2² = 11221211107 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 (11221211101) 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, 4014785 + ... + 4017578.

It is an arithmetic number, because the mean of its divisors is an integer number (1542213888).

Almost surely, 2^11221211111 is an apocalyptic number.

11221211111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11221211111 is a deficient number, since it is larger than the sum of its proper divisors (1116499993).

11221211111 is a wasteful number, since it uses less digits than its factorization.

11221211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8032501.

The product of its digits is 8, while the sum is 14.

Adding to 11221211111 its reverse (11111212211), we get a palindrome (22332423322).

The spelling of 11221211111 in words is "eleven billion, two hundred twenty-one million, two hundred eleven thousand, one hundred eleven".