20001112212111 has 16 divisors (see below), whose sum is σ = 26690520897024. Its totient is φ = 13322890885824.

The previous prime is 20001112212101. The next prime is 20001112212131. The reversal of 20001112212111 is 11121221110002.

It is a happy number.

It is not a de Polignac number, because 20001112212111 - 2⁵ = 20001112212079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001112212101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47854540 + ... + 48270686.

It is an arithmetic number, because the mean of its divisors is an integer number (1668157556064).

Almost surely, 2^{20001112212111} is an apocalyptic number.

20001112212111 is a deficient number, since it is larger than the sum of its proper divisors (6689408684913).

20001112212111 is a wasteful number, since it uses less digits than its factorization.

20001112212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429550.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20001112212111 its reverse (11121221110002), we get a palindrome (31122333322113).

The spelling of 20001112212111 in words is "twenty trillion, one billion, one hundred twelve million, two hundred twelve thousand, one hundred eleven".