21220120102002 has 16 divisors (see below), whose sum is σ = 42721301399232. Its totient is φ = 7026529834800.

The previous prime is 21220120101989. The next prime is 21220120102079. The reversal of 21220120102002 is 20020102102212.

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, 11710882153 + ... + 11710883964.

It is an arithmetic number, because the mean of its divisors is an integer number (2670081337452).

Almost surely, 2^{21220120102002} is an apocalyptic number.

21220120102002 is an abundant number, since it is smaller than the sum of its proper divisors (21501181297230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21220120102002 is a wasteful number, since it uses less digits than its factorization.

21220120102002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23421766273.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21220120102002 its reverse (20020102102212), we get a palindrome (41240222204214).

The spelling of 21220120102002 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty million, one hundred two thousand, two".