20011211111 has 8 divisors (see below), whose sum is σ = 20967913824. Its totient is φ = 19061729280.

The previous prime is 20011211083. The next prime is 20011211117. The reversal of 20011211111 is 11111211002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20011211111 - 2¹⁴ = 20011194727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011211092 and 20011211101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011211117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1799546 + ... + 1810631.

It is an arithmetic number, because the mean of its divisors is an integer number (2620989228).

Almost surely, 2^20011211111 is an apocalyptic number.

20011211111 is a deficient number, since it is larger than the sum of its proper divisors (956702713).

20011211111 is a wasteful number, since it uses less digits than its factorization.

20011211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3610441.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 20011211111 its reverse (11111211002), we get a palindrome (31122422113).

The spelling of 20011211111 in words is "twenty billion, eleven million, two hundred eleven thousand, one hundred eleven".