21000100020202 has 16 divisors (see below), whose sum is σ = 31649249557800. Its totient is φ = 10450383629760.

The previous prime is 21000100020199. The next prime is 21000100020239. The reversal of 21000100020202 is 20202000100012.

It can be written as a sum of positive squares in 4 ways, for example, as 20504133366201 + 495966654001 = 4528149^2 + 704249^2 .

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, 7108677 + ... + 9619432.

Almost surely, 2^{21000100020202} is an apocalyptic number.

21000100020202 is a deficient number, since it is larger than the sum of its proper divisors (10649149537598).

21000100020202 is a wasteful number, since it uses less digits than its factorization.

21000100020202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16731081.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21000100020202 its reverse (20202000100012), we get a palindrome (41202100120214).

The spelling of 21000100020202 in words is "twenty-one trillion, one hundred million, twenty thousand, two hundred two".