1213040123 has 4 divisors (see below), whose sum is σ = 1276884360. Its totient is φ = 1149195888.

The previous prime is 1213040111. The next prime is 1213040131. The reversal of 1213040123 is 3210403121.

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 1213040123 - 2⁴ = 1213040107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213045123) 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, 31922090 + ... + 31922127.

It is an arithmetic number, because the mean of its divisors is an integer number (319221090).

Almost surely, 2^1213040123 is an apocalyptic number.

1213040123 is a deficient number, since it is larger than the sum of its proper divisors (63844237).

1213040123 is an equidigital number, since it uses as much as digits as its factorization.

1213040123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63844236.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1213040123 is about 34828.7255437232. The cubic root of 1213040123 is about 1066.4939316752.

Adding to 1213040123 its reverse (3210403121), we get a palindrome (4423443244).

The spelling of 1213040123 in words is "one billion, two hundred thirteen million, forty thousand, one hundred twenty-three".