20121102012111 has 4 divisors (see below), whose sum is σ = 26828136016152. Its totient is φ = 13414068008072.

The previous prime is 20121102012059. The next prime is 20121102012139. The reversal of 20121102012111 is 11121020112102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20121102012111 - 2¹¹ = 20121102010063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121102017111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3353517002016 + ... + 3353517002021.

It is an arithmetic number, because the mean of its divisors is an integer number (6707034004038).

Almost surely, 2^{20121102012111} is an apocalyptic number.

20121102012111 is a deficient number, since it is larger than the sum of its proper divisors (6707034004041).

20121102012111 is an equidigital number, since it uses as much as digits as its factorization.

20121102012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6707034004040.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20121102012111 its reverse (11121020112102), we get a palindrome (31242122124213).

The spelling of 20121102012111 in words is "twenty trillion, one hundred twenty-one billion, one hundred two million, twelve thousand, one hundred eleven".