20011212012101 has 4 divisors (see below), whose sum is σ = 20209342824204. Its totient is φ = 19813081200000.

The previous prime is 20011212012031. The next prime is 20011212012107. The reversal of 20011212012101 is 10121021211002.

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 9920773875076 + 10090438137025 = 3149726^2 + 3176545^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011212012101 - 2¹⁸ = 20011211749957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011212012107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99065405900 + ... + 99065406101.

It is an arithmetic number, because the mean of its divisors is an integer number (5052335706051).

Almost surely, 2^{20011212012101} is an apocalyptic number.

It is an amenable number.

20011212012101 is a deficient number, since it is larger than the sum of its proper divisors (198130812103).

20011212012101 is a wasteful number, since it uses less digits than its factorization.

20011212012101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198130812102.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20011212012101 its reverse (10121021211002), we get a palindrome (30132233223103).

The spelling of 20011212012101 in words is "twenty trillion, eleven billion, two hundred twelve million, twelve thousand, one hundred one".