20011100211111 has 16 divisors (see below), whose sum is σ = 26702810742528. Its totient is φ = 13330062916800.

The previous prime is 20011100211071. The next prime is 20011100211131. The reversal of 20011100211111 is 11111200111002.

It is not a de Polignac number, because 20011100211111 - 2¹⁷ = 20011100080039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011100211131) 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, 62713291 + ... + 63031571.

It is an arithmetic number, because the mean of its divisors is an integer number (1668925671408).

Almost surely, 2^{20011100211111} is an apocalyptic number.

20011100211111 is a deficient number, since it is larger than the sum of its proper divisors (6691710531417).

20011100211111 is a wasteful number, since it uses less digits than its factorization.

20011100211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334982.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 20011100211111 its reverse (11111200111002), we get a palindrome (31122300322113).

It can be divided in two parts, 200111002 and 11111, that multiplied together give a palindrome (2223433343222).

The spelling of 20011100211111 in words is "twenty trillion, eleven billion, one hundred million, two hundred eleven thousand, one hundred eleven".