2212201222221 has 4 divisors (see below), whose sum is σ = 2949601629632. Its totient is φ = 1474800814812.

The previous prime is 2212201222201. The next prime is 2212201222247. The reversal of 2212201222221 is 1222221022122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2212201222221 - 2⁷ = 2212201222093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212201222201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368700203701 + ... + 368700203706.

It is an arithmetic number, because the mean of its divisors is an integer number (737400407408).

Almost surely, 2^{2212201222221} is an apocalyptic number.

It is an amenable number.

2212201222221 is a deficient number, since it is larger than the sum of its proper divisors (737400407411).

2212201222221 is an equidigital number, since it uses as much as digits as its factorization.

2212201222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737400407410.

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

Adding to 2212201222221 its reverse (1222221022122), we get a palindrome (3434422244343).

It can be divided in two parts, 221220 and 1222221, that added together give a palindrome (1443441).

The spelling of 2212201222221 in words is "two trillion, two hundred twelve billion, two hundred one million, two hundred twenty-two thousand, two hundred twenty-one".