21202022112 has 72 divisors (see below), whose sum is σ = 56101086216.
Its totient is φ = 7011180288.
The previous prime is 21202022071. The next prime is 21202022117. The reversal of 21202022112 is 21122020212.
Adding to 21202022112 its reverse (21122020212), we get a palindrome (42324042324).
It is a junction number, because it is equal to n+sod(n) for n = 21202022091 and 21202022100.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21202022117) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1541538 + ... + 1555230.
It is an arithmetic number, because the mean of its divisors is an integer number (779181753).
Almost surely, 221202022112 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 21202022112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28050543108).
21202022112 is an abundant number, since it is smaller than the sum of its proper divisors (34899064104).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21202022112 is a wasteful number, since it uses less digits than its factorization.
21202022112 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 13960 (or 13825 counting only the distinct ones).
The product of its (nonzero) digits is 64, while the sum is 15.
The spelling of 21202022112 in words is "twenty-one billion, two hundred two million, twenty-two thousand, one hundred twelve".