1212100111011 has 32 divisors (see below), whose sum is σ = 1697885798400. Its totient is φ = 768181249440.

The previous prime is 1212100111009. The next prime is 1212100111031. The reversal of 1212100111011 is 1101110012121.

It is not a de Polignac number, because 1212100111011 - 2¹ = 1212100111009 is a prime.

It is a super-2 number, since 2×1212100111011² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1212100111031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1966000 + ... + 2507858.

It is an arithmetic number, because the mean of its divisors is an integer number (53058931200).

Almost surely, 2^{1212100111011} is an apocalyptic number.

1212100111011 is a deficient number, since it is larger than the sum of its proper divisors (485785687389).

1212100111011 is a wasteful number, since it uses less digits than its factorization.

1212100111011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542319.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1212100111011 its reverse (1101110012121), we get a palindrome (2313210123132).

The spelling of 1212100111011 in words is "one trillion, two hundred twelve billion, one hundred million, one hundred eleven thousand, eleven".