20001111220101 has 32 divisors (see below), whose sum is σ = 29118599497728. Its totient is φ = 12111023642240.

The previous prime is 20001111220073. The next prime is 20001111220141. The reversal of 20001111220101 is 10102211110002.

It is a cyclic number.

It is not a de Polignac number, because 20001111220101 - 2⁶ = 20001111220037 is a prime.

It is a super-2 number, since 2×20001111220101² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001111220141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 449067505 + ... + 449112041.

It is an arithmetic number, because the mean of its divisors is an integer number (909956234304).

Almost surely, 2^{20001111220101} is an apocalyptic number.

It is an amenable number.

20001111220101 is a deficient number, since it is larger than the sum of its proper divisors (9117488277627).

20001111220101 is a wasteful number, since it uses less digits than its factorization.

20001111220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56441.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20001111220101 its reverse (10102211110002), we get a palindrome (30103322330103).

The spelling of 20001111220101 in words is "twenty trillion, one billion, one hundred eleven million, two hundred twenty thousand, one hundred one".