12521340426 has 32 divisors (see below), whose sum is σ = 29047380480. Its totient is φ = 3524129136.

The previous prime is 12521340407. The next prime is 12521340437. The reversal of 12521340426 is 62404312521.

12521340426 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12521340426² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12521340393 and 12521340402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2222016 + ... + 2227643.

It is an arithmetic number, because the mean of its divisors is an integer number (907730640).

Almost surely, 2^12521340426 is an apocalyptic number.

12521340426 is an abundant number, since it is smaller than the sum of its proper divisors (16526040054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12521340426 is a wasteful number, since it uses less digits than its factorization.

12521340426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4449738.

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 12521340426 its reverse (62404312521), we get a palindrome (74925652947).

The spelling of 12521340426 in words is "twelve billion, five hundred twenty-one million, three hundred forty thousand, four hundred twenty-six".