1205140222123 has 4 divisors (see below), whose sum is σ = 1205351618848. Its totient is φ = 1204928825400.

The previous prime is 1205140222067. The next prime is 1205140222157. The reversal of 1205140222123 is 3212220415021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1205140222123 - 2¹³ = 1205140213931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205140222163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105689811 + ... + 105701212.

It is an arithmetic number, because the mean of its divisors is an integer number (301337904712).

Almost surely, 2^{1205140222123} is an apocalyptic number.

1205140222123 is a deficient number, since it is larger than the sum of its proper divisors (211396725).

1205140222123 is an equidigital number, since it uses as much as digits as its factorization.

1205140222123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211396724.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 1205140222123 its reverse (3212220415021), we get a palindrome (4417360637144).

The spelling of 1205140222123 in words is "one trillion, two hundred five billion, one hundred forty million, two hundred twenty-two thousand, one hundred twenty-three".