21220102100002 has 8 divisors (see below), whose sum is σ = 34278626469276. Its totient is φ = 9793893276912.

The previous prime is 21220102099991. The next prime is 21220102100033. The reversal of 21220102100002 is 20000120102212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18010525942161 + 3209576157841 = 4243881^2 + 1791529^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (13).

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 in 3 ways as a sum of consecutive naturals, for example, 408078886513 + ... + 408078886564.

Almost surely, 2^{21220102100002} is an apocalyptic number.

21220102100002 is a deficient number, since it is larger than the sum of its proper divisors (13058524369274).

21220102100002 is a wasteful number, since it uses less digits than its factorization.

21220102100002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816157773092.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21220102100002 its reverse (20000120102212), we get a palindrome (41220222202214).

The spelling of 21220102100002 in words is "twenty-one trillion, two hundred twenty billion, one hundred two million, one hundred thousand, two".