1211100002111 has 4 divisors (see below), whose sum is σ = 1211295252552. Its totient is φ = 1210904751672.

The previous prime is 1211100002089. The next prime is 1211100002117. The reversal of 1211100002111 is 1112000011121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211100002111 is a prime.

It is a super-2 number, since 2×1211100002111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211100002092 and 1211100002101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211100002117) 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, 97615916 + ... + 97628321.

It is an arithmetic number, because the mean of its divisors is an integer number (302823813138).

Almost surely, 2^{1211100002111} is an apocalyptic number.

1211100002111 is a deficient number, since it is larger than the sum of its proper divisors (195250441).

1211100002111 is an equidigital number, since it uses as much as digits as its factorization.

1211100002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195250440.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1211100002111 its reverse (1112000011121), we get a palindrome (2323100013232).

The spelling of 1211100002111 in words is "one trillion, two hundred eleven billion, one hundred million, two thousand, one hundred eleven".