21001220000102 has 4 divisors (see below), whose sum is σ = 31501830000156. Its totient is φ = 10500610000050.

The previous prime is 21001220000093. The next prime is 21001220000141. The reversal of 21001220000102 is 20100002210012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5250305000024 + ... + 5250305000027.

It is an arithmetic number, because the mean of its divisors is an integer number (7875457500039).

Almost surely, 2^{21001220000102} is an apocalyptic number.

21001220000102 is a deficient number, since it is larger than the sum of its proper divisors (10500610000054).

21001220000102 is a wasteful number, since it uses less digits than its factorization.

21001220000102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10500610000053.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21001220000102 its reverse (20100002210012), we get a palindrome (41101222210114).

The spelling of 21001220000102 in words is "twenty-one trillion, one billion, two hundred twenty million, one hundred two", and thus it is an aban number.