20001212011111 has 8 divisors (see below), whose sum is σ = 20087795820384. Its totient is φ = 19914737458560.

The previous prime is 20001212011021. The next prime is 20001212011117. The reversal of 20001212011111 is 11111021210002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20001212011111 - 2¹¹ = 20001212009063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001212011091 and 20001212011100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001212011117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26947246 + ... + 27679531.

It is an arithmetic number, because the mean of its divisors is an integer number (2510974477548).

Almost surely, 2^{20001212011111} is an apocalyptic number.

20001212011111 is a deficient number, since it is larger than the sum of its proper divisors (86583809273).

20001212011111 is a wasteful number, since it uses less digits than its factorization.

20001212011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54628361.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20001212011111 its reverse (11111021210002), we get a palindrome (31112233221113).

The spelling of 20001212011111 in words is "twenty trillion, one billion, two hundred twelve million, eleven thousand, one hundred eleven".