2021221222211 has 4 divisors (see below), whose sum is σ = 2026163083800. Its totient is φ = 2016279360624.

The previous prime is 2021221222201. The next prime is 2021221222247. The reversal of 2021221222211 is 1122221221202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2021221222211 - 2⁶ = 2021221222147 is a prime.

It is a super-2 number, since 2×2021221222211² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021221222201) 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, 2470930181 + ... + 2470930998.

It is an arithmetic number, because the mean of its divisors is an integer number (506540770950).

Almost surely, 2^{2021221222211} is an apocalyptic number.

2021221222211 is a deficient number, since it is larger than the sum of its proper divisors (4941861589).

2021221222211 is an equidigital number, since it uses as much as digits as its factorization.

2021221222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4941861588.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2021221222211 its reverse (1122221221202), we get a palindrome (3143442443413).

The spelling of 2021221222211 in words is "two trillion, twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred eleven".