1211212122111 has 12 divisors (see below), whose sum is σ = 1750406483488. Its totient is φ = 807069580704.

The previous prime is 1211212122077. The next prime is 1211212122119. The reversal of 1211212122111 is 1112212121121.

It is a happy number.

1211212122111 is a `hidden beast` number, since 121 + 121 + 212 + 211 + 1 = 666.

It is not a de Polignac number, because 1211212122111 - 2²² = 1211207927807 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 (1211212122119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33745015 + ... + 33780888.

Almost surely, 2^{1211212122111} is an apocalyptic number.

1211212122111 is a deficient number, since it is larger than the sum of its proper divisors (539194361377).

1211212122111 is a wasteful number, since it uses less digits than its factorization.

1211212122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67527902 (or 67527899 counting only the distinct ones).

The product of its digits is 32, while the sum is 18.

Adding to 1211212122111 its reverse (1112212121121), we get a palindrome (2323424243232).

The spelling of 1211212122111 in words is "one trillion, two hundred eleven billion, two hundred twelve million, one hundred twenty-two thousand, one hundred eleven".