20111120112121 has 4 divisors (see below), whose sum is σ = 20112077304144. Its totient is φ = 20110162920100.

The previous prime is 20111120112049. The next prime is 20111120112217. The reversal of 20111120112121 is 12121102111102.

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 20111120112121 - 2²⁷ = 20110985894393 is a prime.

It is a super-2 number, since 2×20111120112121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111120112095 and 20111120112104.

It is not an unprimeable number, because it can be changed into a prime (20111120116121) 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, 478564495 + ... + 478606516.

It is an arithmetic number, because the mean of its divisors is an integer number (5028019326036).

Almost surely, 2^{20111120112121} is an apocalyptic number.

It is an amenable number.

20111120112121 is a deficient number, since it is larger than the sum of its proper divisors (957192023).

20111120112121 is an equidigital number, since it uses as much as digits as its factorization.

20111120112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957192022.

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

Adding to 20111120112121 its reverse (12121102111102), we get a palindrome (32232222223223).

The spelling of 20111120112121 in words is "twenty trillion, one hundred eleven billion, one hundred twenty million, one hundred twelve thousand, one hundred twenty-one".