21220120102102 has 48 divisors (see below), whose sum is σ = 33077105349120. Its totient is φ = 10205414749296.

The previous prime is 21220120102079. The next prime is 21220120102117. The reversal of 21220120102102 is 20120102102212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1557204613 + ... + 1557218239.

It is an arithmetic number, because the mean of its divisors is an integer number (689106361440).

Almost surely, 2^{21220120102102} is an apocalyptic number.

21220120102102 is a deficient number, since it is larger than the sum of its proper divisors (11856985247018).

21220120102102 is a wasteful number, since it uses less digits than its factorization.

21220120102102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18553 (or 18494 counting only the distinct ones).

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

Adding to 21220120102102 its reverse (20120102102212), we get a palindrome (41340222204314).

It can be divided in two parts, 212 and 20120102102, that multiplied together give a palindrome (4265461645624).

The spelling of 21220120102102 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty million, one hundred two thousand, one hundred two".