21202001222201 has 16 divisors (see below), whose sum is σ = 21669357405696. Its totient is φ = 20735325487296.

The previous prime is 21202001222179. The next prime is 21202001222243. The reversal of 21202001222201 is 10222210020212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21202001222201 - 2³⁰ = 21200927480377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21202001222201.

It is not an unprimeable number, because it can be changed into a prime (21202001222261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 939502220 + ... + 939524786.

It is an arithmetic number, because the mean of its divisors is an integer number (1354334837856).

Almost surely, 2^{21202001222201} is an apocalyptic number.

It is an amenable number.

21202001222201 is a deficient number, since it is larger than the sum of its proper divisors (467356183495).

21202001222201 is a wasteful number, since it uses less digits than its factorization.

21202001222201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36728.

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

Adding to 21202001222201 its reverse (10222210020212), we get a palindrome (31424211242413).

The spelling of 21202001222201 in words is "twenty-one trillion, two hundred two billion, one million, two hundred twenty-two thousand, two hundred one".