12505424021 has 8 divisors (see below), whose sum is σ = 12846796800. Its totient is φ = 12164229648.

The previous prime is 12505423951. The next prime is 12505424027. The reversal of 12505424021 is 12042450521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12505424021 - 2²⁶ = 12438315157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12505424027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104180 + ... + 189378.

It is an arithmetic number, because the mean of its divisors is an integer number (1605849600).

Almost surely, 2^12505424021 is an apocalyptic number.

It is an amenable number.

12505424021 is a deficient number, since it is larger than the sum of its proper divisors (341372779).

12505424021 is an equidigital number, since it uses as much as digits as its factorization.

12505424021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89203.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 12505424021 its reverse (12042450521), we get a palindrome (24547874542).

The spelling of 12505424021 in words is "twelve billion, five hundred five million, four hundred twenty-four thousand, twenty-one".