1212011111111 has 8 divisors (see below), whose sum is σ = 1224245925264. Its totient is φ = 1199780899200.

The previous prime is 1212011111093. The next prime is 1212011111123. The reversal of 1212011111111 is 1111111102121.

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 1212011111111 - 2¹⁴ = 1212011094727 is a prime.

It is a Duffinian number.

1212011111111 is a modest number, since divided by 1111111 gives 121201 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212011111011) 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, 619970 + ... + 1675823.

It is an arithmetic number, because the mean of its divisors is an integer number (153030740658).

Almost surely, 2^{1212011111111} is an apocalyptic number.

1212011111111 is a deficient number, since it is larger than the sum of its proper divisors (12234814153).

1212011111111 is a wasteful number, since it uses less digits than its factorization.

1212011111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2301121.

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 1212011111111 its reverse (1111111102121), we get a palindrome (2323122213232).

The spelling of 1212011111111 in words is "one trillion, two hundred twelve billion, eleven million, one hundred eleven thousand, one hundred eleven".