1213310123 has 4 divisors (see below), whose sum is σ = 1239125280. Its totient is φ = 1187494968.

The previous prime is 1213310083. The next prime is 1213310141. The reversal of 1213310123 is 3210133121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3210133121 = 13 ⋅246933317.

It is a cyclic number.

It is not a de Polignac number, because 1213310123 - 2²⁴ = 1196532907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213310143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12907508 + ... + 12907601.

It is an arithmetic number, because the mean of its divisors is an integer number (309781320).

Almost surely, 2^1213310123 is an apocalyptic number.

1213310123 is a deficient number, since it is larger than the sum of its proper divisors (25815157).

1213310123 is an equidigital number, since it uses as much as digits as its factorization.

1213310123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25815156.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1213310123 is about 34832.6014388819. The cubic root of 1213310123 is about 1066.5730529932.

Adding to 1213310123 its reverse (3210133121), we get a palindrome (4423443244).

The spelling of 1213310123 in words is "one billion, two hundred thirteen million, three hundred ten thousand, one hundred twenty-three".