20112311210121 has 24 divisors (see below), whose sum is σ = 31328152914240. Its totient is φ = 12360058798176.

The previous prime is 20112311210083. The next prime is 20112311210129. The reversal of 20112311210121 is 12101211321102.

It is a happy number.

20112311210121 is a `hidden beast` number, since 20 + 1 + 1 + 2 + 311 + 210 + 121 = 666.

It is not a de Polignac number, because 20112311210121 - 2⁷ = 20112311209993 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20112311210094 and 20112311210103.

It is not an unprimeable number, because it can be changed into a prime (20112311210129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116219421 + ... + 116392346.

It is an arithmetic number, because the mean of its divisors is an integer number (1305339704760).

Almost surely, 2^{20112311210121} is an apocalyptic number.

It is an amenable number.

20112311210121 is a deficient number, since it is larger than the sum of its proper divisors (11215841704119).

20112311210121 is a wasteful number, since it uses less digits than its factorization.

20112311210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232612525 (or 232612522 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 20112311210121 its reverse (12101211321102), we get a palindrome (32213522531223).

The spelling of 20112311210121 in words is "twenty trillion, one hundred twelve billion, three hundred eleven million, two hundred ten thousand, one hundred twenty-one".