20121110211121 has 4 divisors (see below), whose sum is σ = 20141832261744. Its totient is φ = 20100388160500.

The previous prime is 20121110211109. The next prime is 20121110211143. The reversal of 20121110211121 is 12111201112102.

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 20121110211121 - 2⁹ = 20121110210609 is a prime.

It is a super-2 number, since 2×20121110211121² (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 = 20121110211095 and 20121110211104.

It is not an unprimeable number, because it can be changed into a prime (20121110211161) 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, 10361023855 + ... + 10361025796.

It is an arithmetic number, because the mean of its divisors is an integer number (5035458065436).

Almost surely, 2^{20121110211121} is an apocalyptic number.

It is an amenable number.

20121110211121 is a deficient number, since it is larger than the sum of its proper divisors (20722050623).

20121110211121 is an equidigital number, since it uses as much as digits as its factorization.

20121110211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20722050622.

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

Adding to 20121110211121 its reverse (12111201112102), we get a palindrome (32232311323223).

The spelling of 20121110211121 in words is "twenty trillion, one hundred twenty-one billion, one hundred ten million, two hundred eleven thousand, one hundred twenty-one".