1221000110123 has 6 divisors (see below), whose sum is σ = 1222817524164. Its totient is φ = 1219185393216.

The previous prime is 1221000110069. The next prime is 1221000110173. The reversal of 1221000110123 is 3210110001221.

It is not a de Polignac number, because 1221000110123 - 2¹⁰ = 1221000109099 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221000110098 and 1221000110107.

It is not an unprimeable number, because it can be changed into a prime (1221000110173) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 894965 + ... + 1800822.

It is an arithmetic number, because the mean of its divisors is an integer number (203802920694).

Almost surely, 2^{1221000110123} is an apocalyptic number.

1221000110123 is a deficient number, since it is larger than the sum of its proper divisors (1817414041).

1221000110123 is an frugal number, since it uses more digits than its factorization.

1221000110123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2697133 (or 2696460 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 1221000110123 its reverse (3210110001221), we get a palindrome (4431110111344).

The spelling of 1221000110123 in words is "one trillion, two hundred twenty-one billion, one hundred ten thousand, one hundred twenty-three".