21220202012201 has 8 divisors (see below), whose sum is σ = 21962205493320. Its totient is φ = 20478883356288.

The previous prime is 21220202012183. The next prime is 21220202012203. The reversal of 21220202012201 is 10221020202212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4182984976 + 21216019027225 = 64676^2 + 4606085^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220202012201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21220202012201.

It is not an unprimeable number, because it can be changed into a prime (21220202012203) 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, 171143246 + ... + 171267191.

It is an arithmetic number, because the mean of its divisors is an integer number (2745275686665).

Almost surely, 2^{21220202012201} is an apocalyptic number.

It is an amenable number.

21220202012201 is a deficient number, since it is larger than the sum of its proper divisors (742003481119).

21220202012201 is a wasteful number, since it uses less digits than its factorization.

21220202012201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342412603.

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

Adding to 21220202012201 its reverse (10221020202212), we get a palindrome (31441222214413).

The spelling of 21220202012201 in words is "twenty-one trillion, two hundred twenty billion, two hundred two million, twelve thousand, two hundred one".