21210220221201 has 24 divisors (see below), whose sum is σ = 33746652254016. Its totient is φ = 12729876207840.

The previous prime is 21210220221173. The next prime is 21210220221277. The reversal of 21210220221201 is 10212202201212.

It is a happy number.

21210220221201 is a `hidden beast` number, since 2 + 1 + 21 + 0 + 220 + 221 + 201 = 666.

It is not a de Polignac number, because 21210220221201 - 2⁹ = 21210220220689 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21210220221101) 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 23 ways as a sum of consecutive naturals, for example, 1040012370 + ... + 1040032763.

It is an arithmetic number, because the mean of its divisors is an integer number (1406110510584).

Almost surely, 2^{21210220221201} is an apocalyptic number.

It is an amenable number.

21210220221201 is a deficient number, since it is larger than the sum of its proper divisors (12536432032815).

21210220221201 is a wasteful number, since it uses less digits than its factorization.

21210220221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2080045253 (or 2080045250 counting only the distinct ones).

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

Adding to 21210220221201 its reverse (10212202201212), we get a palindrome (31422422422413).

The spelling of 21210220221201 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty million, two hundred twenty-one thousand, two hundred one".