221002210120221 has 6 divisors (see below), whose sum is σ = 319225414618110. Its totient is φ = 147334806746808.

The previous prime is 221002210120201. The next prime is 221002210120259. The reversal of 221002210120221 is 122021012200122.

It is a happy number.

221002210120221 is a `hidden beast` number, since 2 + 2 + 100 + 221 + 0 + 120 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 135765258867225 + 85236951252996 = 11651835^2 + 9232386^2 .

It is not a de Polignac number, because 221002210120221 - 2⁹ = 221002210119709 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221002210120194 and 221002210120203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221002210120201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12277900562226 + ... + 12277900562243.

It is an arithmetic number, because the mean of its divisors is an integer number (53204235769685).

Almost surely, 2^{221002210120221} is an apocalyptic number.

It is an amenable number.

221002210120221 is a deficient number, since it is larger than the sum of its proper divisors (98223204497889).

221002210120221 is a wasteful number, since it uses less digits than its factorization.

221002210120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24555801124475 (or 24555801124472 counting only the distinct ones).

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

Adding to 221002210120221 its reverse (122021012200122), we get a palindrome (343023222320343).

The spelling of 221002210120221 in words is "two hundred twenty-one trillion, two billion, two hundred ten million, one hundred twenty thousand, two hundred twenty-one".