20002111212111 has 32 divisors (see below), whose sum is σ = 32293673008128. Its totient is φ = 10750318256640.

The previous prime is 20002111212071. The next prime is 20002111212169. The reversal of 20002111212111 is 11121211120002.

It is a happy number.

It is not a de Polignac number, because 20002111212111 - 2¹⁵ = 20002111179343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002111212311) 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 31 ways as a sum of consecutive naturals, for example, 18000720 + ... + 19079573.

It is an arithmetic number, because the mean of its divisors is an integer number (1009177281504).

Almost surely, 2^{20002111212111} is an apocalyptic number.

20002111212111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20002111212111 is a deficient number, since it is larger than the sum of its proper divisors (12291561796017).

20002111212111 is a wasteful number, since it uses less digits than its factorization.

20002111212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37081831.

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

Adding to 20002111212111 its reverse (11121211120002), we get a palindrome (31123322332113).

It can be divided in two parts, 20002 and 111212111, that multiplied together give a palindrome (2224464644222).

The spelling of 20002111212111 in words is "twenty trillion, two billion, one hundred eleven million, two hundred twelve thousand, one hundred eleven".