12520021343 has 4 divisors (see below), whose sum is σ = 12521522520. Its totient is φ = 12518520168.

The previous prime is 12520021289. The next prime is 12520021387. The reversal of 12520021343 is 34312002521.

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 12520021343 - 2⁶ = 12520021279 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 (12520021543) 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, 738008 + ... + 754781.

It is an arithmetic number, because the mean of its divisors is an integer number (3130380630).

Almost surely, 2^12520021343 is an apocalyptic number.

12520021343 is a deficient number, since it is larger than the sum of its proper divisors (1501177).

12520021343 is an equidigital number, since it uses as much as digits as its factorization.

12520021343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501176.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 12520021343 its reverse (34312002521), we get a palindrome (46832023864).

The spelling of 12520021343 in words is "twelve billion, five hundred twenty million, twenty-one thousand, three hundred forty-three".