1211111113211 has 8 divisors (see below), whose sum is σ = 1274864547600. Its totient is φ = 1147358753280.

The previous prime is 1211111113207. The next prime is 1211111113253. The reversal of 1211111113211 is 1123111111121.

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 1211111113211 - 2² = 1211111113207 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211111113211.

It is not an unprimeable number, because it can be changed into a prime (1211111143211) 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, 3181355 + ... + 3541643.

It is an arithmetic number, because the mean of its divisors is an integer number (159358068450).

Almost surely, 2^{1211111113211} is an apocalyptic number.

1211111113211 is a deficient number, since it is larger than the sum of its proper divisors (63753434389).

1211111113211 is a wasteful number, since it uses less digits than its factorization.

1211111113211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537229.

The product of its digits is 12, while the sum is 17.

Adding to 1211111113211 its reverse (1123111111121), we get a palindrome (2334222224332).

The spelling of 1211111113211 in words is "one trillion, two hundred eleven billion, one hundred eleven million, one hundred thirteen thousand, two hundred eleven".