21221220221102 has 16 divisors (see below), whose sum is σ = 34725759893424. Its totient is φ = 9645973968000.

The previous prime is 21221220221041. The next prime is 21221220221129. The reversal of 21221220221102 is 20112202212212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4972652 + ... + 8195712.

It is an arithmetic number, because the mean of its divisors is an integer number (2170359993339).

Almost surely, 2^{21221220221102} is an apocalyptic number.

21221220221102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21221220221102 is a deficient number, since it is larger than the sum of its proper divisors (13504539672322).

21221220221102 is a wasteful number, since it uses less digits than its factorization.

21221220221102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3522355.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21221220221102 its reverse (20112202212212), we get a palindrome (41333422433314).

The spelling of 21221220221102 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred twenty-one thousand, one hundred two".