1221222112123 has 16 divisors (see below), whose sum is σ = 1320099814656. Its totient is φ = 1123051531680.

The previous prime is 1221222112063. The next prime is 1221222112139. The reversal of 1221222112123 is 3212112221221.

It is a de Polignac number, because none of the positive numbers 2^k-1221222112123 is a prime.

It is a super-2 number, since 2×1221222112123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221222112094 and 1221222112103.

It is not an unprimeable number, because it can be changed into a prime (1221222112423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17886336 + ... + 17954482.

It is an arithmetic number, because the mean of its divisors is an integer number (82506238416).

Almost surely, 2^{1221222112123} is an apocalyptic number.

1221222112123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1221222112123 is a deficient number, since it is larger than the sum of its proper divisors (98877702533).

1221222112123 is a wasteful number, since it uses less digits than its factorization.

1221222112123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73314.

The product of its digits is 384, while the sum is 22.

Adding to 1221222112123 its reverse (3212112221221), we get a palindrome (4433334333344).

The spelling of 1221222112123 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred twelve thousand, one hundred twenty-three".