21020122011112 has 64 divisors (see below), whose sum is σ = 45494045907840. Its totient is φ = 8918457696000.

The previous prime is 21020122011079. The next prime is 21020122011113. The reversal of 21020122011112 is 21111022102012.

It is not an unprimeable number, because it can be changed into a prime (21020122011113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52951687 + ... + 53347177.

It is an arithmetic number, because the mean of its divisors is an integer number (710844467310).

Almost surely, 2^{21020122011112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020122011112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22747022953920).

21020122011112 is an abundant number, since it is smaller than the sum of its proper divisors (24473923896728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21020122011112 is a wasteful number, since it uses less digits than its factorization.

21020122011112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405002 (or 404998 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21020122011112 its reverse (21111022102012), we get a palindrome (42131144113124).

The spelling of 21020122011112 in words is "twenty-one trillion, twenty billion, one hundred twenty-two million, eleven thousand, one hundred twelve".