20112112221121 has 4 divisors (see below), whose sum is σ = 20125583161812. Its totient is φ = 20098641280432.

The previous prime is 20112112221049. The next prime is 20112112221133. The reversal of 20112112221121 is 12112221121102.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17785922936896 + 2326189284225 = 4217336^2 + 1525185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20112112221121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20112112221521) 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, 6735468106 + ... + 6735471091.

It is an arithmetic number, because the mean of its divisors is an integer number (5031395790453).

Almost surely, 2^{20112112221121} is an apocalyptic number.

It is an amenable number.

20112112221121 is a deficient number, since it is larger than the sum of its proper divisors (13470940691).

20112112221121 is a wasteful number, since it uses less digits than its factorization.

20112112221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13470940690.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 20112112221121 its reverse (12112221121102), we get a palindrome (32224333342223).

The spelling of 20112112221121 in words is "twenty trillion, one hundred twelve billion, one hundred twelve million, two hundred twenty-one thousand, one hundred twenty-one".