20121102011111 has 4 divisors (see below), whose sum is σ = 20197608102672. Its totient is φ = 20044595919552.

The previous prime is 20121102011011. The next prime is 20121102011137. The reversal of 20121102011111 is 11111020112102.

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 20121102011111 - 2⁴² = 15723055500007 is a prime.

It is a super-2 number, since 2×20121102011111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121102011011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38253045386 + ... + 38253045911.

It is an arithmetic number, because the mean of its divisors is an integer number (5049402025668).

Almost surely, 2^{20121102011111} is an apocalyptic number.

20121102011111 is a deficient number, since it is larger than the sum of its proper divisors (76506091561).

20121102011111 is an equidigital number, since it uses as much as digits as its factorization.

20121102011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76506091560.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 20121102011111 its reverse (11111020112102), we get a palindrome (31232122123213).

The spelling of 20121102011111 in words is "twenty trillion, one hundred twenty-one billion, one hundred two million, eleven thousand, one hundred eleven".