201221002210221 has 48 divisors (see below), whose sum is σ = 333764470740480. Its totient is φ = 114433056128160.

The previous prime is 201221002210219. The next prime is 201221002210253. The reversal of 201221002210221 is 122012200122102.

It is a happy number.

201221002210221 is a `hidden beast` number, since 2 + 0 + 1 + 221 + 0 + 0 + 221 + 0 + 221 = 666.

It is not a de Polignac number, because 201221002210221 - 2¹ = 201221002210219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201221002210194 and 201221002210203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221002210201) 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, 288628366 + ... + 289324688.

It is an arithmetic number, because the mean of its divisors is an integer number (6953426473760).

Almost surely, 2^{201221002210221} is an apocalyptic number.

201221002210221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

201221002210221 is a deficient number, since it is larger than the sum of its proper divisors (132543468530259).

201221002210221 is a wasteful number, since it uses less digits than its factorization.

201221002210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718286 (or 718283 counting only the distinct ones).

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

Adding to 201221002210221 its reverse (122012200122102), we get a palindrome (323233202332323).

The spelling of 201221002210221 in words is "two hundred one trillion, two hundred twenty-one billion, two million, two hundred ten thousand, two hundred twenty-one".