12104157523 has 4 divisors (see below), whose sum is σ = 12104843608. Its totient is φ = 12103471440.

The previous prime is 12104157517. The next prime is 12104157551. The reversal of 12104157523 is 32575140121.

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 12104157523 - 2¹³ = 12104149331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12104157503) 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, 315861 + ... + 352102.

It is an arithmetic number, because the mean of its divisors is an integer number (3026210902).

Almost surely, 2^12104157523 is an apocalyptic number.

12104157523 is a deficient number, since it is larger than the sum of its proper divisors (686085).

12104157523 is an equidigital number, since it uses as much as digits as its factorization.

12104157523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686084.

The product of its (nonzero) digits is 8400, while the sum is 31.

Adding to 12104157523 its reverse (32575140121), we get a palindrome (44679297644).

The spelling of 12104157523 in words is "twelve billion, one hundred four million, one hundred fifty-seven thousand, five hundred twenty-three".