1211101212111 has 8 divisors (see below), whose sum is σ = 1845487561344. Its totient is φ = 692057835480.

The previous prime is 1211101212103. The next prime is 1211101212163. The reversal of 1211101212111 is 1112121011121.

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

It is not a de Polignac number, because 1211101212111 - 2³ = 1211101212103 is a prime.

It is a super-2 number, since 2×1211101212111² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211101312111) 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, 28835743125 + ... + 28835743166.

It is an arithmetic number, because the mean of its divisors is an integer number (230685945168).

Almost surely, 2^{1211101212111} is an apocalyptic number.

1211101212111 is a deficient number, since it is larger than the sum of its proper divisors (634386349233).

1211101212111 is an equidigital number, since it uses as much as digits as its factorization.

1211101212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57671486301.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1211101212111 its reverse (1112121011121), we get a palindrome (2323222223232).

The spelling of 1211101212111 in words is "one trillion, two hundred eleven billion, one hundred one million, two hundred twelve thousand, one hundred eleven".