21202021222201 has 8 divisors (see below), whose sum is σ = 22449368431080. Its totient is φ = 19954692845568.

The previous prime is 21202021222189. The next prime is 21202021222211. The reversal of 21202021222201 is 10222212020212.

It can be written as a sum of positive squares in 4 ways, for example, as 710320268025 + 20491700954176 = 842805^2 + 4526776^2 .

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

It is not a de Polignac number, because 21202021222201 - 2⁴¹ = 19002997966649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202021222211) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2356596 + ... + 6925141.

It is an arithmetic number, because the mean of its divisors is an integer number (2806171053885).

Almost surely, 2^{21202021222201} is an apocalyptic number.

It is an amenable number.

21202021222201 is a deficient number, since it is larger than the sum of its proper divisors (1247347208879).

21202021222201 is a wasteful number, since it uses less digits than its factorization.

21202021222201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9416123.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21202021222201 its reverse (10222212020212), we get a palindrome (31424233242413).

The spelling of 21202021222201 in words is "twenty-one trillion, two hundred two billion, twenty-one million, two hundred twenty-two thousand, two hundred one".