2222111212021 has 2 divisors, whose sum is σ = 2222111212022. Its totient is φ = 2222111212020.

The previous prime is 2222111212019. The next prime is 2222111212039. The reversal of 2222111212021 is 1202121112222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1612173641796 + 609937570225 = 1269714^2 + 780985^2 .

It is a cyclic number.

It is not a de Polignac number, because 2222111212021 - 2¹ = 2222111212019 is a prime.

It is a super-2 number, since 2×2222111212021² (a number of 25 digits) contains 22 as substring.

Together with 2222111212019, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2222111212021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2222111212051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1111055606010 + 1111055606011.

It is an arithmetic number, because the mean of its divisors is an integer number (1111055606011).

Almost surely, 2^{2222111212021} is an apocalyptic number.

It is an amenable number.

2222111212021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2222111212021 is an equidigital number, since it uses as much as digits as its factorization.

2222111212021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 2222111212021 its reverse (1202121112222), we get a palindrome (3424232324243).

The spelling of 2222111212021 in words is "two trillion, two hundred twenty-two billion, one hundred eleven million, two hundred twelve thousand, twenty-one".