12421434525 has 24 divisors (see below), whose sum is σ = 20576254464. Its totient is φ = 6612028800.

The previous prime is 12421434503. The next prime is 12421434577. The reversal of 12421434525 is 52543412421.

It is not a de Polignac number, because 12421434525 - 2⁶ = 12421434461 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 119869 + ... + 198018.

It is an arithmetic number, because the mean of its divisors is an integer number (857343936).

Almost surely, 2^12421434525 is an apocalyptic number.

12421434525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12421434525 is a deficient number, since it is larger than the sum of its proper divisors (8154819939).

12421434525 is a wasteful number, since it uses less digits than its factorization.

12421434525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318421 (or 318416 counting only the distinct ones).

The product of its digits is 38400, while the sum is 33.

Adding to 12421434525 its reverse (52543412421), we get a palindrome (64964846946).

The spelling of 12421434525 in words is "twelve billion, four hundred twenty-one million, four hundred thirty-four thousand, five hundred twenty-five".