20120111112121 has 4 divisors (see below), whose sum is σ = 20588020672912. Its totient is φ = 19652201551332.

The previous prime is 20120111112077. The next prime is 20120111112139. The reversal of 20120111112121 is 12121111102102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20120111112121 - 2⁷ = 20120111111993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20120111112095 and 20120111112104.

It is not an unprimeable number, because it can be changed into a prime (20120111112421) 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, 233954780331 + ... + 233954780416.

It is an arithmetic number, because the mean of its divisors is an integer number (5147005168228).

Almost surely, 2^{20120111112121} is an apocalyptic number.

It is an amenable number.

20120111112121 is a deficient number, since it is larger than the sum of its proper divisors (467909560791).

20120111112121 is an equidigital number, since it uses as much as digits as its factorization.

20120111112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467909560790.

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

Adding to 20120111112121 its reverse (12121111102102), we get a palindrome (32241222214223).

The spelling of 20120111112121 in words is "twenty trillion, one hundred twenty billion, one hundred eleven million, one hundred twelve thousand, one hundred twenty-one".