21001112102 has 4 divisors (see below), whose sum is σ = 31501668156.
Its totient is φ = 10500556050.
The previous prime is 21001112071. The next prime is 21001112117. The reversal of 21001112102 is 20121110012.
Adding to 21001112102 its reverse (20121110012), we get a palindrome (41122222114).
It is a semiprime because it is the product of two primes.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250278024 + ... + 5250278027.
It is an arithmetic number, because the mean of its divisors is an integer number (7875417039).
Almost surely, 221001112102 is an apocalyptic number.
21001112102 is a deficient number, since it is larger than the sum of its proper divisors (10500556054).
21001112102 is a wasteful number, since it uses less digits than its factorization.
21001112102 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 10500556053.
The product of its (nonzero) digits is 8, while the sum is 11.
The spelling of 21001112102 in words is "twenty-one billion, one million, one hundred twelve thousand, one hundred two".