21222001221201 has 48 divisors (see below), whose sum is σ = 34362330020928. Its totient is φ = 12507717340800.

The previous prime is 21222001221163. The next prime is 21222001221247. The reversal of 21222001221201 is 10212210022212.

It is a happy number.

21222001221201 is a `hidden beast` number, since 21 + 2 + 220 + 0 + 1 + 221 + 201 = 666.

It is not a de Polignac number, because 21222001221201 - 2¹⁰ = 21222001220177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222001221271) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5573095 + ... + 8573411.

It is an arithmetic number, because the mean of its divisors is an integer number (715881875436).

Almost surely, 2^{21222001221201} is an apocalyptic number.

It is an amenable number.

21222001221201 is a deficient number, since it is larger than the sum of its proper divisors (13140328799727).

21222001221201 is a wasteful number, since it uses less digits than its factorization.

21222001221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3002302 (or 3002299 counting only the distinct ones).

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

Adding to 21222001221201 its reverse (10212210022212), we get a palindrome (31434211243413).

The spelling of 21222001221201 in words is "twenty-one trillion, two hundred twenty-two billion, one million, two hundred twenty-one thousand, two hundred one".