21002100010202 has 4 divisors (see below), whose sum is σ = 31503150015306. Its totient is φ = 10501050005100.

The previous prime is 21002100010153. The next prime is 21002100010259. The reversal of 21002100010202 is 20201000120012.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 20977416772321 + 24683237881 = 4580111^2 + 157109^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250525002549 + ... + 5250525002552.

Almost surely, 2^{21002100010202} is an apocalyptic number.

21002100010202 is a deficient number, since it is larger than the sum of its proper divisors (10501050005104).

21002100010202 is a wasteful number, since it uses less digits than its factorization.

21002100010202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10501050005103.

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

Adding to 21002100010202 its reverse (20201000120012), we get a palindrome (41203100130214).

The spelling of 21002100010202 in words is "twenty-one trillion, two billion, one hundred million, ten thousand, two hundred two".