221221001220222 has 64 divisors (see below), whose sum is σ = 473631890688000. Its totient is φ = 68673792312288.

The previous prime is 221221001220221. The next prime is 221221001220227. The reversal of 221221001220222 is 222022100122122.

It is a super-2 number, since 2×221221001220222² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221001220221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 353333583 + ... + 353959125.

It is an arithmetic number, because the mean of its divisors is an integer number (7400498292000).

Almost surely, 2^{221221001220222} is an apocalyptic number.

221221001220222 is an abundant number, since it is smaller than the sum of its proper divisors (252410889467778).

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

221221001220222 is a wasteful number, since it uses less digits than its factorization.

221221001220222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678205.

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

Adding to 221221001220222 its reverse (222022100122122), we get a palindrome (443243101342344).

The spelling of 221221001220222 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, one million, two hundred twenty thousand, two hundred twenty-two".