21101221200212 has 24 divisors (see below), whose sum is σ = 37740409346304. Its totient is φ = 10318575535712.

The previous prime is 21101221200211. The next prime is 21101221200217. The reversal of 21101221200212 is 21200212210112.

It is a super-2 number, since 2×21101221200212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101221200211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40796603 + ... + 41310594.

It is an arithmetic number, because the mean of its divisors is an integer number (1572517056096).

Almost surely, 2^{21101221200212} is an apocalyptic number.

It is an amenable number.

21101221200212 is a deficient number, since it is larger than the sum of its proper divisors (16639188146092).

21101221200212 is a wasteful number, since it uses less digits than its factorization.

21101221200212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82108615 (or 82108613 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21101221200212 its reverse (21200212210112), we get a palindrome (42301433410324).

The spelling of 21101221200212 in words is "twenty-one trillion, one hundred one billion, two hundred twenty-one million, two hundred thousand, two hundred twelve".