221220201222 has 128 divisors (see below), whose sum is σ = 505079193600. Its totient is φ = 71750448000.

The previous prime is 221220201217. The next prime is 221220201227. The reversal of 221220201222 is 222102022122.

221220201222 is a `hidden beast` number, since 2 + 21 + 220 + 201 + 222 = 666.

It is an interprime number because it is at equal distance from previous prime (221220201217) and next prime (221220201227).

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 = 221220201195 and 221220201204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220201227) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 153731179 + ... + 153732617.

It is an arithmetic number, because the mean of its divisors is an integer number (3945931200).

Almost surely, 2^221220201222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221220201222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252539596800).

221220201222 is an abundant number, since it is smaller than the sum of its proper divisors (283858992378).

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

221220201222 is a wasteful number, since it uses less digits than its factorization.

221220201222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019 (or 2013 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 221220201222 its reverse (222102022122), we get a palindrome (443322223344).

The spelling of 221220201222 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred one thousand, two hundred twenty-two".