1212111122211 has 36 divisors (see below), whose sum is σ = 1986542434240. Its totient is φ = 710915594400.

The previous prime is 1212111122153. The next prime is 1212111122213. The reversal of 1212111122211 is 1122211112121.

It is a happy number.

1212111122211 is a `hidden beast` number, since 121 + 211 + 1 + 122 + 211 = 666.

It is not a de Polignac number, because 1212111122211 - 2¹¹ = 1212111120163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212111122213) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 17918656 + ... + 17986173.

Almost surely, 2^{1212111122211} is an apocalyptic number.

1212111122211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1212111122211 is a deficient number, since it is larger than the sum of its proper divisors (774431312029).

1212111122211 is a wasteful number, since it uses less digits than its factorization.

1212111122211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35904888 (or 35904874 counting only the distinct ones).

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

Adding to 1212111122211 its reverse (1122211112121), we get a palindrome (2334322234332).

The spelling of 1212111122211 in words is "one trillion, two hundred twelve billion, one hundred eleven million, one hundred twenty-two thousand, two hundred eleven".