1220220221111 has 2 divisors, whose sum is σ = 1220220221112. Its totient is φ = 1220220221110.

The previous prime is 1220220221069. The next prime is 1220220221113. The reversal of 1220220221111 is 1111220220221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220220221111 - 2²⁶ = 1220153112247 is a prime.

It is a super-4 number, since 4×1220220221111⁴ (a number of 49 digits) contains 4444 as substring.

Together with 1220220221113, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220220221111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220220221113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610110110555 + 610110110556.

It is an arithmetic number, because the mean of its divisors is an integer number (610110110556).

Almost surely, 2^{1220220221111} is an apocalyptic number.

1220220221111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220220221111 is an equidigital number, since it uses as much as digits as its factorization.

1220220221111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1220220221111 its reverse (1111220220221), we get a palindrome (2331440441332).

It can be divided in two parts, 1220220221 and 111, that multiplied together give a palindrome (135444444531).

The spelling of 1220220221111 in words is "one trillion, two hundred twenty billion, two hundred twenty million, two hundred twenty-one thousand, one hundred eleven".