21201222210201 has 72 divisors (see below), whose sum is σ = 34449921105600. Its totient is φ = 12548209988160.

The previous prime is 21201222210109. The next prime is 21201222210209. The reversal of 21201222210201 is 10201222210212.

It is a happy number.

21201222210201 is a `hidden beast` number, since 2 + 120 + 122 + 221 + 0 + 201 = 666.

It is not a de Polignac number, because 21201222210201 - 2⁷ = 21201222210073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21201222210209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 290244055 + ... + 290317091.

Almost surely, 2^{21201222210201} is an apocalyptic number.

It is an amenable number.

21201222210201 is a deficient number, since it is larger than the sum of its proper divisors (13248698895399).

21201222210201 is a wasteful number, since it uses less digits than its factorization.

21201222210201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79307 (or 79293 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21201222210201 its reverse (10201222210212), we get a palindrome (31402444420413).

The spelling of 21201222210201 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, two hundred ten thousand, two hundred one".