20121211011 has 16 divisors (see below), whose sum is σ = 29556995328. Its totient is φ = 12073932000.

The previous prime is 20121211001. The next prime is 20121211021. The reversal of 20121211011 is 11011212102.

It is an interprime number because it is at equal distance from previous prime (20121211001) and next prime (20121211021).

It is not a de Polignac number, because 20121211011 - 2²³ = 20112822403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121211001) 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, 3015151 + ... + 3021816.

It is an arithmetic number, because the mean of its divisors is an integer number (1847312208).

Almost surely, 2^20121211011 is an apocalyptic number.

20121211011 is a deficient number, since it is larger than the sum of its proper divisors (9435784317).

20121211011 is a wasteful number, since it uses less digits than its factorization.

20121211011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6037082.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20121211011 its reverse (11011212102), we get a palindrome (31132423113).

It can be divided in two parts, 20121 and 211011, that added together give a palindrome (231132).

The spelling of 20121211011 in words is "twenty billion, one hundred twenty-one million, two hundred eleven thousand, eleven".