21201221120110 has 32 divisors (see below), whose sum is σ = 38394792374400. Its totient is φ = 8428848709920.

The previous prime is 21201221120081. The next prime is 21201221120111. The reversal of 21201221120110 is 1102112210212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201221120111) by changing a digit.

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, 549925 + ... + 6534895.

It is an arithmetic number, because the mean of its divisors is an integer number (1199837261700).

Almost surely, 2^{21201221120110} is an apocalyptic number.

21201221120110 is a deficient number, since it is larger than the sum of its proper divisors (17193571254290).

21201221120110 is a wasteful number, since it uses less digits than its factorization.

21201221120110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5987136.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21201221120110 its reverse (1102112210212), we get a palindrome (22303333330322).

The spelling of 21201221120110 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-one million, one hundred twenty thousand, one hundred ten".