12523042021 has 4 divisors (see below), whose sum is σ = 14312048032. Its totient is φ = 10734036012.

The previous prime is 12523041989. The next prime is 12523042057. The reversal of 12523042021 is 12024032521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12024032521 = 89 ⋅135101489.

It is not a de Polignac number, because 12523042021 - 2⁵ = 12523041989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12523041983 and 12523042001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12523042121) 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, 894502995 + ... + 894503008.

It is an arithmetic number, because the mean of its divisors is an integer number (3578012008).

Almost surely, 2^12523042021 is an apocalyptic number.

It is an amenable number.

12523042021 is a deficient number, since it is larger than the sum of its proper divisors (1789006011).

12523042021 is an equidigital number, since it uses as much as digits as its factorization.

12523042021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789006010.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 12523042021 its reverse (12024032521), we get a palindrome (24547074542).

The spelling of 12523042021 in words is "twelve billion, five hundred twenty-three million, forty-two thousand, twenty-one".