20011121011 has 8 divisors (see below), whose sum is σ = 23096287584. Its totient is φ = 16982563200.

The previous prime is 20011120999. The next prime is 20011121017. The reversal of 20011121011 is 11012111002.

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 20011121011 - 2⁵ = 20011120979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011121017) 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, 14151430 + ... + 14152843.

It is an arithmetic number, because the mean of its divisors is an integer number (2887035948).

Almost surely, 2^20011121011 is an apocalyptic number.

20011121011 is a deficient number, since it is larger than the sum of its proper divisors (3085166573).

20011121011 is a wasteful number, since it uses less digits than its factorization.

20011121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28304381.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20011121011 its reverse (11012111002), we get a palindrome (31023232013).

It can be divided in two parts, 200111 and 21011, that added together give a palindrome (221122).

The spelling of 20011121011 in words is "twenty billion, eleven million, one hundred twenty-one thousand, eleven".