21201220202202 has 24 divisors (see below), whose sum is σ = 45936181355220. Its totient is φ = 7067041977600.

The previous prime is 21201220202191. The next prime is 21201220202233. The reversal of 21201220202202 is 20220202210212.

21201220202202 is a `hidden beast` number, since 2 + 1 + 201 + 220 + 20 + 220 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21200969011401 + 251190801 = 4604451^2 + 15849^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1737952 + ... + 6739652.

Almost surely, 2^{21201220202202} is an apocalyptic number.

21201220202202 is an abundant number, since it is smaller than the sum of its proper divisors (24734961153018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21201220202202 is a wasteful number, since it uses less digits than its factorization.

21201220202202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5237198 (or 5237195 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21201220202202 its reverse (20220202210212), we get a palindrome (41421422412414).

The spelling of 21201220202202 in words is "twenty-one trillion, two hundred one billion, two hundred twenty million, two hundred two thousand, two hundred two".