21100220212012 has 48 divisors (see below), whose sum is σ = 39373047000000. Its totient is φ = 9859571431424.

The previous prime is 21100220211911. The next prime is 21100220212111. The reversal of 21100220212012 is 21021202200112.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 30038664 + ... + 30733072.

It is an arithmetic number, because the mean of its divisors is an integer number (820271812500).

Almost surely, 2^{21100220212012} is an apocalyptic number.

It is an amenable number.

21100220212012 is a deficient number, since it is larger than the sum of its proper divisors (18272826787988).

21100220212012 is a wasteful number, since it uses less digits than its factorization.

21100220212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697578 (or 697576 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21100220212012 its reverse (21021202200112), we get a palindrome (42121422412124).

The spelling of 21100220212012 in words is "twenty-one trillion, one hundred billion, two hundred twenty million, two hundred twelve thousand, twelve".