221001201220122 has 24 divisors (see below), whose sum is σ = 478929586858164. Its totient is φ = 73652659245504.

The previous prime is 221001201220087. The next prime is 221001201220147. The reversal of 221001201220122 is 221022102100122.

It is a happy number.

221001201220122 is a `hidden beast` number, since 22 + 100 + 1 + 201 + 220 + 122 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 161252181617121 + 59749019603001 = 12698511^2 + 7729749^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 221001201220095 and 221001201220104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1200557733 + ... + 1200741800.

Almost surely, 2^{221001201220122} is an apocalyptic number.

221001201220122 is an abundant number, since it is smaller than the sum of its proper divisors (257928385638042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221001201220122 is a wasteful number, since it uses less digits than its factorization.

221001201220122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2401304654 (or 2401304651 counting only the distinct ones).

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

Adding to 221001201220122 its reverse (221022102100122), we get a palindrome (442023303320244).

The spelling of 221001201220122 in words is "two hundred twenty-one trillion, one billion, two hundred one million, two hundred twenty thousand, one hundred twenty-two".