221001001222 has 16 divisors (see below), whose sum is σ = 332507286000. Its totient is φ = 110165695488.

The previous prime is 221001001187. The next prime is 221001001229. The reversal of 221001001222 is 222100100122.

It is a happy number.

It is a super-2 number, since 2×221001001222² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001001229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 861718 + ... + 1088374.

It is an arithmetic number, because the mean of its divisors is an integer number (20781705375).

Almost surely, 2^221001001222 is an apocalyptic number.

221001001222 is a deficient number, since it is larger than the sum of its proper divisors (111506284778).

221001001222 is a wasteful number, since it uses less digits than its factorization.

221001001222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228135.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221001001222 its reverse (222100100122), we get a palindrome (443101101344).

It can be divided in two parts, 22100100122 and 2, that multiplied together give a palindrome (44200200244).

The spelling of 221001001222 in words is "two hundred twenty-one billion, one million, one thousand, two hundred twenty-two".