1221222111123 has 24 divisors (see below), whose sum is σ = 1894192905360. Its totient is φ = 697821868800.

The previous prime is 1221222111071. The next prime is 1221222111127. The reversal of 1221222111123 is 3211112221221.

It is not a de Polignac number, because 1221222111123 - 2⁶ = 1221222111059 is a prime.

It is a super-2 number, since 2×1221222111123² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 1221222111123.

It is not an unprimeable number, because it can be changed into a prime (1221222111127) 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 in 23 ways as a sum of consecutive naturals, for example, 6494223 + ... + 6679623.

It is an arithmetic number, because the mean of its divisors is an integer number (78924704390).

Almost surely, 2^{1221222111123} is an apocalyptic number.

1221222111123 is a deficient number, since it is larger than the sum of its proper divisors (672970794237).

1221222111123 is a wasteful number, since it uses less digits than its factorization.

1221222111123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230227 (or 230220 counting only the distinct ones).

The product of its digits is 192, while the sum is 21.

Adding to 1221222111123 its reverse (3211112221221), we get a palindrome (4432334332344).

The spelling of 1221222111123 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred eleven thousand, one hundred twenty-three".