21222121120102 has 16 divisors (see below), whose sum is σ = 36380852658720. Its totient is φ = 9095176366848.

The previous prime is 21222121120033. The next prime is 21222121120117. The reversal of 21222121120102 is 20102112122212.

It is a self number, because there is not a number n which added to its sum of digits gives 21222121120102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7449174 + ... + 9896182.

It is an arithmetic number, because the mean of its divisors is an integer number (2273803291170).

Almost surely, 2^{21222121120102} is an apocalyptic number.

21222121120102 is a deficient number, since it is larger than the sum of its proper divisors (15158731538618).

21222121120102 is a wasteful number, since it uses less digits than its factorization.

21222121120102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3066495.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21222121120102 its reverse (20102112122212), we get a palindrome (41324233242314).

The spelling of 21222121120102 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-one million, one hundred twenty thousand, one hundred two".