20121101111211 has 12 divisors (see below), whose sum is σ = 27721475416296. Its totient is φ = 12981355553760.

The previous prime is 20121101111191. The next prime is 20121101111213. The reversal of 20121101111211 is 11211110112102.

It is not a de Polignac number, because 20121101111211 - 2¹⁸ = 20121100849067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121101111213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3489608826 + ... + 3489614591.

It is an arithmetic number, because the mean of its divisors is an integer number (2310122951358).

Almost surely, 2^{20121101111211} is an apocalyptic number.

20121101111211 is a deficient number, since it is larger than the sum of its proper divisors (7600374305085).

20121101111211 is an equidigital number, since it uses as much as digits as its factorization.

20121101111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6979223482 (or 6979223451 counting only the distinct ones).

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

Adding to 20121101111211 its reverse (11211110112102), we get a palindrome (31332211223313).

The spelling of 20121101111211 in words is "twenty trillion, one hundred twenty-one billion, one hundred one million, one hundred eleven thousand, two hundred eleven".