20012211011 has 32 divisors (see below), whose sum is σ = 23286009600. Its totient is φ = 17031665664.

The previous prime is 20012211007. The next prime is 20012211019. The reversal of 20012211011 is 11011221002.

It is not a de Polignac number, because 20012211011 - 2² = 20012211007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20012210983 and 20012211001.

It is not an unprimeable number, because it can be changed into a prime (20012211019) 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, 12918665 + ... + 12920213.

It is an arithmetic number, because the mean of its divisors is an integer number (727687800).

Almost surely, 2^20012211011 is an apocalyptic number.

20012211011 is a deficient number, since it is larger than the sum of its proper divisors (3273798589).

20012211011 is a wasteful number, since it uses less digits than its factorization.

20012211011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2735.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20012211011 its reverse (11011221002), we get a palindrome (31023432013).

Subtracting from 20012211011 its reverse (11011221002), we obtain a palindrome (9000990009).

The spelling of 20012211011 in words is "twenty billion, twelve million, two hundred eleven thousand, eleven".