1211212111011 has 8 divisors (see below), whose sum is σ = 1845656550144. Its totient is φ = 692121206280.

The previous prime is 1211212111007. The next prime is 1211212111033. The reversal of 1211212111011 is 1101112121121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211212111011 - 2² = 1211212111007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211212111061) 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, 28838383575 + ... + 28838383616.

It is an arithmetic number, because the mean of its divisors is an integer number (230707068768).

Almost surely, 2^{1211212111011} is an apocalyptic number.

1211212111011 is a deficient number, since it is larger than the sum of its proper divisors (634444439133).

1211212111011 is an equidigital number, since it uses as much as digits as its factorization.

1211212111011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57676767201.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1211212111011 its reverse (1101112121121), we get a palindrome (2312324232132).

It can be divided in two parts, 12112121110 and 11, that added together give a palindrome (12112121121).

The spelling of 1211212111011 in words is "one trillion, two hundred eleven billion, two hundred twelve million, one hundred eleven thousand, eleven".