2211222122221 has 8 divisors (see below), whose sum is σ = 2530934165504. Its totient is φ = 1892465871120.

The previous prime is 2211222122209. The next prime is 2211222122269. The reversal of 2211222122221 is 1222212221122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2211222122221 - 2⁵ = 2211222122189 is a prime.

It is a super-3 number, since 3×2211222122221³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2211222122192 and 2211222122201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211222122321) 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, 238943085 + ... + 238952338.

It is an arithmetic number, because the mean of its divisors is an integer number (316366770688).

Almost surely, 2^{2211222122221} is an apocalyptic number.

It is an amenable number.

2211222122221 is a deficient number, since it is larger than the sum of its proper divisors (319712043283).

2211222122221 is an equidigital number, since it uses as much as digits as its factorization.

2211222122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477896091.

The product of its digits is 512, while the sum is 22.

Adding to 2211222122221 its reverse (1222212221122), we get a palindrome (3433434343343).

The spelling of 2211222122221 in words is "two trillion, two hundred eleven billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred twenty-one".