20011211122011 has 16 divisors (see below), whose sum is σ = 26792955560448. Its totient is φ = 13285251482400.

The previous prime is 20011211121961. The next prime is 20011211122027. The reversal of 20011211122011 is 11022111211002.

It is a happy number.

It is not a de Polignac number, because 20011211122011 - 2⁶ = 20011211121947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20011211122061) 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, 13604161 + ... + 15003186.

It is an arithmetic number, because the mean of its divisors is an integer number (1674559722528).

Almost surely, 2^{20011211122011} is an apocalyptic number.

20011211122011 is a deficient number, since it is larger than the sum of its proper divisors (6781744438437).

20011211122011 is a wasteful number, since it uses less digits than its factorization.

20011211122011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28608322.

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

Adding to 20011211122011 its reverse (11022111211002), we get a palindrome (31033322333013).

The spelling of 20011211122011 in words is "twenty trillion, eleven billion, two hundred eleven million, one hundred twenty-two thousand, eleven".