21220201012221 has 32 divisors (see below), whose sum is σ = 31762178697600. Its totient is φ = 14000740790400.

The previous prime is 21220201012193. The next prime is 21220201012229. The reversal of 21220201012221 is 12221010202212.

It is a happy number.

21220201012221 is a `hidden beast` number, since 21 + 220 + 201 + 0 + 1 + 2 + 221 = 666.

It is not a de Polignac number, because 21220201012221 - 2¹³ = 21220201004029 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21220201012194 and 21220201012203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220201012229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4715025 + ... + 8041881.

It is an arithmetic number, because the mean of its divisors is an integer number (992568084300).

Almost surely, 2^{21220201012221} is an apocalyptic number.

It is an amenable number.

21220201012221 is a deficient number, since it is larger than the sum of its proper divisors (10541977685379).

21220201012221 is a wasteful number, since it uses less digits than its factorization.

21220201012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3329306 (or 3329300 counting only the distinct ones).

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

Adding to 21220201012221 its reverse (12221010202212), we get a palindrome (33441211214433).

The spelling of 21220201012221 in words is "twenty-one trillion, two hundred twenty billion, two hundred one million, twelve thousand, two hundred twenty-one".