21112012121011 has 16 divisors (see below), whose sum is σ = 24282930816000. Its totient is φ = 17980159938048.

The previous prime is 21112012121009. The next prime is 21112012121027. The reversal of 21112012121011 is 11012121021112.

It is not a de Polignac number, because 21112012121011 - 2¹ = 21112012121009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112012121051) 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, 13301445 + ... + 14803798.

It is an arithmetic number, because the mean of its divisors is an integer number (1517683176000).

Almost surely, 2^{21112012121011} is an apocalyptic number.

21112012121011 is a deficient number, since it is larger than the sum of its proper divisors (3170918694989).

21112012121011 is a wasteful number, since it uses less digits than its factorization.

21112012121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28105938.

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

Adding to 21112012121011 its reverse (11012121021112), we get a palindrome (32124133142123).

The spelling of 21112012121011 in words is "twenty-one trillion, one hundred twelve billion, twelve million, one hundred twenty-one thousand, eleven".