21011011012 has 12 divisors (see below), whose sum is σ = 37133322156.
Its totient is φ = 10401490400.
The previous prime is 21011010973. The next prime is 21011011033.
It can be divided in two parts, 210110 and 11012, that added together give a palindrome (221122).
21011011012 is nontrivially palindromic in base 10.
It can be written as a sum of positive squares in 2 ways, for example, as 20470169476 + 540841536 = 143074^2 + 23256^2
It is a self number, because there is not a number n which added to its sum of digits gives 21011011012.
It is an unprimeable number.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26003323 + ... + 26004130.
It is an arithmetic number, because the mean of its divisors is an integer number (3094443513).
Almost surely, 221011011012 is an apocalyptic number.
It is an amenable number.
21011011012 is a deficient number, since it is larger than the sum of its proper divisors (16122311144).
21011011012 is a wasteful number, since it uses less digits than its factorization.
21011011012 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 52007558 (or 52007556 counting only the distinct ones).
The product of its (nonzero) digits is 4, while the sum is 10.
The spelling of 21011011012 in words is "twenty-one billion, eleven million, eleven thousand, twelve".