21200121202202 has 8 divisors (see below), whose sum is σ = 32400185233716. Its totient is φ = 10400059457632.

The previous prime is 21200121202189. The next prime is 21200121202223. The reversal of 21200121202202 is 20220212100212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21172044513481 + 28076688721 = 4601309^2 + 167561^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100000571603 + ... + 100000571814.

Almost surely, 2^{21200121202202} is an apocalyptic number.

21200121202202 is a deficient number, since it is larger than the sum of its proper divisors (11200064031514).

21200121202202 is a wasteful number, since it uses less digits than its factorization.

21200121202202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200001143472.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21200121202202 its reverse (20220212100212), we get a palindrome (41420333302414).

The spelling of 21200121202202 in words is "twenty-one trillion, two hundred billion, one hundred twenty-one million, two hundred two thousand, two hundred two".