2212212220221 has 4 divisors (see below), whose sum is σ = 2949616293632. Its totient is φ = 1474808146812.

The previous prime is 2212212220201. The next prime is 2212212220237. The reversal of 2212212220221 is 1220222122122.

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 a de Polignac number, because none of the positive numbers 2^k-2212212220221 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 (2212212220201) 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, 368702036701 + ... + 368702036706.

It is an arithmetic number, because the mean of its divisors is an integer number (737404073408).

Almost surely, 2^{2212212220221} is an apocalyptic number.

It is an amenable number.

2212212220221 is a deficient number, since it is larger than the sum of its proper divisors (737404073411).

2212212220221 is an equidigital number, since it uses as much as digits as its factorization.

2212212220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737404073410.

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

Adding to 2212212220221 its reverse (1220222122122), we get a palindrome (3432434342343).

It can be divided in two parts, 221221 and 2220221, that added together give a palindrome (2441442).

The spelling of 2212212220221 in words is "two trillion, two hundred twelve billion, two hundred twelve million, two hundred twenty thousand, two hundred twenty-one".