221201222100222 has 128 divisors (see below), whose sum is σ = 557840197877760. Its totient is φ = 56909304207360.

The previous prime is 221201222100179. The next prime is 221201222100233. The reversal of 221201222100222 is 222001222102122.

221201222100222 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221201222100222² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 194482179 + ... + 195616257.

It is an arithmetic number, because the mean of its divisors is an integer number (4358126545920).

Almost surely, 2^{221201222100222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221201222100222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278920098938880).

221201222100222 is an abundant number, since it is smaller than the sum of its proper divisors (336638975777538).

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

221201222100222 is a wasteful number, since it uses less digits than its factorization.

221201222100222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142858.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 221201222100222 its reverse (222001222102122), we get a palindrome (443202444202344).

The spelling of 221201222100222 in words is "two hundred twenty-one trillion, two hundred one billion, two hundred twenty-two million, one hundred thousand, two hundred twenty-two".