20112021111 has 16 divisors (see below), whose sum is σ = 33004342784. Its totient is φ = 10608538464.

The previous prime is 20112021089. The next prime is 20112021119. The reversal of 20112021111 is 11112021102.

It is not a de Polignac number, because 20112021111 - 2⁵ = 20112021079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112021119) 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 15 ways as a sum of consecutive naturals, for example, 36834931 + ... + 36835476.

It is an arithmetic number, because the mean of its divisors is an integer number (2062771424).

Almost surely, 2^20112021111 is an apocalyptic number.

20112021111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20112021111 is a deficient number, since it is larger than the sum of its proper divisors (12892321673).

20112021111 is a wasteful number, since it uses less digits than its factorization.

20112021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73670430.

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

Adding to 20112021111 its reverse (11112021102), we get a palindrome (31224042213).

Subtracting from 20112021111 its reverse (11112021102), we obtain a palindrome (9000000009).

The spelling of 20112021111 in words is "twenty billion, one hundred twelve million, twenty-one thousand, one hundred eleven".