21101222011212 has 96 divisors (see below), whose sum is σ = 63976142630400. Its totient is φ = 5888713110336.

The previous prime is 21101222011171. The next prime is 21101222011231. The reversal of 21101222011212 is 21211022210112.

21101222011212 is a `hidden beast` number, since 211 + 0 + 12 + 220 + 11 + 212 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 324521787 + ... + 324586802.

It is an arithmetic number, because the mean of its divisors is an integer number (666418152400).

Almost surely, 2^{21101222011212} is an apocalyptic number.

It is an amenable number.

21101222011212 is an abundant number, since it is smaller than the sum of its proper divisors (42874920619188).

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

21101222011212 is a wasteful number, since it uses less digits than its factorization.

21101222011212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649108652 (or 649108644 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21101222011212 its reverse (21211022210112), we get a palindrome (42312244221324).

The spelling of 21101222011212 in words is "twenty-one trillion, one hundred one billion, two hundred twenty-two million, eleven thousand, two hundred twelve".