1220111111423 has 2 divisors, whose sum is σ = 1220111111424. Its totient is φ = 1220111111422.

The previous prime is 1220111111383. The next prime is 1220111111441. The reversal of 1220111111423 is 3241111110221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220111111423 - 2¹⁶ = 1220111045887 is a prime.

It is a super-2 number, since 2×1220111111423² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1220111111395 and 1220111111404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220111116423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610055555711 + 610055555712.

It is an arithmetic number, because the mean of its divisors is an integer number (610055555712).

Almost surely, 2^{1220111111423} is an apocalyptic number.

1220111111423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220111111423 is an equidigital number, since it uses as much as digits as its factorization.

1220111111423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 1220111111423 its reverse (3241111110221), we get a palindrome (4461222221644).

The spelling of 1220111111423 in words is "one trillion, two hundred twenty billion, one hundred eleven million, one hundred eleven thousand, four hundred twenty-three".