21011122111012 has 12 divisors (see below), whose sum is σ = 40112142212016. Its totient is φ = 9550510050440.

The previous prime is 21011122110997. The next prime is 21011122111013.

21011122111012 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (21011122111013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238762751218 + ... + 238762751305.

It is an arithmetic number, because the mean of its divisors is an integer number (3342678517668).

Almost surely, 2^{21011122111012} is an apocalyptic number.

21011122111012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21011122111012 is a deficient number, since it is larger than the sum of its proper divisors (19101020101004).

21011122111012 is a wasteful number, since it uses less digits than its factorization.

21011122111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477525502538 (or 477525502536 counting only the distinct ones).

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

It can be divided in two parts, 2101112 and 2111012, that added together give a palindrome (4212124).

The spelling of 21011122111012 in words is "twenty-one trillion, eleven billion, one hundred twenty-two million, one hundred eleven thousand, twelve".