1211000122111 has 8 divisors (see below), whose sum is σ = 1319866677360. Its totient is φ = 1104378238272.

The previous prime is 1211000122099. The next prime is 1211000122121. The reversal of 1211000122111 is 1112210001121.

It is a happy number.

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 1211000122111 - 2⁹ = 1211000121599 is a prime.

It is a super-2 number, since 2×1211000122111² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211000122091 and 1211000122100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211000122121) 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, 561166726 + ... + 561168883.

It is an arithmetic number, because the mean of its divisors is an integer number (164983334670).

Almost surely, 2^{1211000122111} is an apocalyptic number.

1211000122111 is a deficient number, since it is larger than the sum of its proper divisors (108866555249).

1211000122111 is a wasteful number, since it uses less digits than its factorization.

1211000122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122335705.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1211000122111 its reverse (1112210001121), we get a palindrome (2323210123232).

The spelling of 1211000122111 in words is "one trillion, two hundred eleven billion, one hundred twenty-two thousand, one hundred eleven".