2222201221221 has 16 divisors (see below), whose sum is σ = 2970900100224. Its totient is φ = 1477487499264.

The previous prime is 2222201221199. The next prime is 2222201221259. The reversal of 2222201221221 is 1221221022222.

It is not a de Polignac number, because 2222201221221 - 2⁹ = 2222201220709 is a prime.

It is a super-2 number, since 2×2222201221221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2222201221621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3129520 + ... + 3773366.

It is an arithmetic number, because the mean of its divisors is an integer number (185681256264).

Almost surely, 2^{2222201221221} is an apocalyptic number.

It is an amenable number.

2222201221221 is a deficient number, since it is larger than the sum of its proper divisors (748698879003).

2222201221221 is a wasteful number, since it uses less digits than its factorization.

2222201221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646940.

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

Adding to 2222201221221 its reverse (1221221022222), we get a palindrome (3443422243443).

It can be divided in two parts, 222220 and 1221221, that added together give a palindrome (1443441).

The spelling of 2222201221221 in words is "two trillion, two hundred twenty-two billion, two hundred one million, two hundred twenty-one thousand, two hundred twenty-one".