20111111010111 has 32 divisors (see below), whose sum is σ = 29474739141120. Its totient is φ = 12096305251200.

The previous prime is 20111111010101. The next prime is 20111111010143. The reversal of 20111111010111 is 11101011111102.

It is not a de Polignac number, because 20111111010111 - 2²⁹ = 20110574139199 is a prime.

It is a super-2 number, since 2×20111111010111² (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 (20111111010101) 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, 1928320 + ... + 6628773.

It is an arithmetic number, because the mean of its divisors is an integer number (921085598160).

Almost surely, 2^{20111111010111} is an apocalyptic number.

20111111010111 is a deficient number, since it is larger than the sum of its proper divisors (9363628131009).

20111111010111 is a wasteful number, since it uses less digits than its factorization.

20111111010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8557647.

The product of its (nonzero) digits is 2, while the sum is 12.

Adding to 20111111010111 its reverse (11101011111102), we get a palindrome (31212122121213).

The spelling of 20111111010111 in words is "twenty trillion, one hundred eleven billion, one hundred eleven million, ten thousand, one hundred eleven".